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The category of Personal/Participant/Inhabitant derived nouns comprises a conglomeration of derived nouns that denote among others agents, instruments, patients/themes, inhabitants, and followers of a person. Based on the thematic relations between the derived noun and its base lexeme, Personal/Participant/Inhabitant nouns can be classified into two subclasses. The first subclass comprises derived nouns that are deverbal and carry thematic readings (e.g., driver). The second subclass consists of derived nouns with athematic readings (e.g., Marxist). The examination of the category of Personal/Participant/Inhabitant nouns allows one to delve deeply into the study of multiplicity of meaning in word formation and the factors that bear on the readings of derived words. These factors range from the historical mechanisms that lead to multiplicity of meaning and the lexical-semantic properties of the bases that derived nouns are based on, to the syntactic context into which derived nouns occur, and the pragmatic-encyclopedic facets of both the base and the derived lexeme.

This chapter is an overview of the structure of words belonging to the major lexical categories (nouns and verbs) in Niger-Congo languages, with an emphasis on the morphological patterns typically found in the core Niger-Congo languages commonly considered as relatively conservative in their morphology: rich systems of verb morphology, both inflectional and derivational, and systems of gender-number marking with a relative high number of genders, and no possibility to isolate number marking from gender marking. As regards formal aspects of the structure of words, as a rule, verb forms are morphologically more complex than nominal forms. The highest degree of synthesis is found in the verbal morphology of some Bantu languages. Both prefixes and suffixes are found. Cumulative exponence is typically found in gender-number marking. Multiple exponence is very common in the verbal morphology of Bantu language but rather uncommon in the remainder of Niger-Congo. Consonant alternations are common in several groups of Niger-Congo languages, and various types of tonal alternations play an important role in the morphology of many Niger-Congo languages. The categories most commonly expressed in the inflectional morphology of nouns are gender, number, definiteness, and possession. The inflectional morphology of verbs commonly expresses agreement, TAM, and polarity, and is also widely used to express interclausal dependencies and information structure. As regards word formation, the situation is not uniform across the language groups included in Niger-Congo, but rich systems of verb-to-verb derivation are typically found in the Niger-Congo languages whose morphological patterns are commonly viewed as conservative.

An agent noun is a derived noun whose general meaning is ‘person who does . . .’. It is thus characterized by the feature [+ Human], regardless of whether the person involved actually performs an action (e.g., French nageur ‘swimmer’, i.e., ‘a person who swims’), carries out a profession (e.g., Spanish cabrero ‘goatherd’, i.e., ‘a person who looks after goats’), adheres to a certain ideology or group (e.g., Italian femminista ‘feminist’, i.e., ‘a person who supports or follows the feminist movement’), and so on. Agent nouns are for the most part denominal (as with cabrero and femminista above) and deverbal (as with nageur above). Latin denominal agent nouns were mainly formed with -arius, though the Latin agentive suffix par excellence was -tor, which derived nouns from verbs. Latin denominal agents were also formed with -ista, a borrowing from Greek -ιστήϛ. The reflexes of all three suffixes are widespread and highly productive in the Romance languages, as in the case of Portuguese/Spanish/Catalan/Occitan pescador ‘fisherman’ (-dor < -torem), French boucher ‘butcher’ (-er < -arium), and Romanian flautist (-ist < -ista). At any rate, the distinction between denominal and deverbal agent nouns is not always straightforward, as demonstrated by the Romance forms connected with the Latin present particle -nte, for whereas the majority display a verbal base (e.g., Italian cantante ‘singer’ ← cantare ‘to sing’), there are some which do not (e.g., Italian bracciante ‘hired hand’ ← braccio ‘arm’), thus allowing them to be regarded as denominal derivations. A minor group of agent nouns is made up of deadjectival derivations, often conveying a pejorative meaning; such is the case with Italian elegantone ‘person of overblown elegance’ (← elegante ‘elegant’) and French richard ‘very rich person’ (← riche ‘rich’).

In linguistics, the study of quantity is concerned with the behavior of expressions that refer to amounts in terms of the internal structure of objects and events, their spatial or temporal extension (as duration and boundedness), their qualifying properties, as well as how these aspects interact with each other and other linguistic phenomena. Quantity is primarily manifest in language for the lexical categories of noun, verb, and adjective/ adverb. For instance, the distinction between mass and count nouns is essentially quantitative: it indicates how nominal denotation is quantized—as substance (e.g., water, sand) or as an atomic individual (e.g., book, boy). Similarly, the aspectual classes of verbs, such as states (know), activities (run), accomplishments (drown), achievements (notice), and semelfactives (knock) represent quantitatively different types of events. Adjectives and adverbs may lexically express quantities in relation to individuals, respectively, events (e.g., little, enough, much, often), and one might argue that numerals (two, twenty) are intrinsic quantitative expressions. Quantitative derivation refers to the use of derivational affixes to encode quantity in language. For instance, the English suffix -ful attaches to a noun N1 to derive another noun N2, such that N2 denotes the quantity that fits in the container denoted by N1. N2 also employs a special use in quantitative constructions: see hand—a handful of berries. The challenge for the linguistic description of quantity is that it often combines with other linguistic notions such as evaluation, intensification, quality, and it does not have a specific unitary realization—it is usually auxiliary on other more established notions. Quantitative affixes either have limited productivity or their primary use is for other semantic notions. For instance, the German suffix ‑schaft typically forms abstract nouns as in Vaterschaft ‘fatherhood’, but has a (quantity-related) collective meaning in Lehrerschaft ‘lecturer staff’; compare English -hood in childhood and the collective neighborhood. This diversity makes quantity difficult to capture systematically, in spite of its pervasiveness as a semantic notion.

Headedness is a pervasive phenomenon throughout different components of the grammar, which fundamentally encodes an asymmetry between two or more items, such that one is in some sense more important than the other(s). In phonology for instance, the nucleus is the head of the syllable, and not the onset or the coda, whereas in syntax, the verb is the head of a verb phrase, rather than any complements or specifiers that it combines with. It makes sense, then, to question whether the notion of headedness applies to the morphology as well; specifically, do words—complex or simplex—have heads that determine the properties of the word as a whole? Intuitively it makes sense that words have heads: a noun that is derived from an adjective like redness can function only as a noun, and the presence of red in the structure does not confer on the whole form the ability to function as an adjective as well. However, this question is a complex one for a variety of reasons. While it seems clear for some phenomena such as category determination that words have heads, there is a lot of evidence to suggest that the properties of complex words are not all derived from one morpheme, but rather that the features are gathered from potentially numerous morphemes within the same word. Furthermore, properties that characterize heads compared to dependents, particularly based on syntactic behavior, do not unambigously pick out a single element, but the tests applied to morphology at times pick out affixes, and at times pick out bases as the head of the whole word.

The term productivity most commonly applies to word formation, but in principle it can be applied to any linguistic process. A process is said to be productive if it applies without restriction to give rise to novel expressions, for instance, new words. Ideally, speakers apply productive processes without conscious deliberation and in principle they can be applied by any and all competent native speakers. Creative coining of words, by contrast, is typically a one-off intentional act (nonce word creation), often of one individual, and often with the aim of drawing attention to the coined word for the purposes of advertising, humor, and so on. Creative coining often involves extra-grammatical processes which cannot be described deterministically, unlike bona fide linguistic rules. However, many productive processes are restricted in various ways, and some of the extra-grammatical devices are very frequent, so the distinction between productive, grammatical word formation and (nonce) word creation is blurred.

Denominal verbs are verbs formed from nouns by means of various word-formation processes such as derivation, conversion, or less common mechanisms like reduplication, change of pitch, or root and pattern. Because their well-formedness is determined by morphosyntactic, phonological, and semantic constraints, they have been analyzed from a variety of lexicalist and non-lexicalist perspectives, including Optimality Theory, Lexical Semantics, Cognitive Grammar, Onomasiology, and Neo-Construction Grammar. Independently of their structural shape, denominal verbs have in common that they denote events in which the referents of their base nouns (e.g., computer in the case of computerize) participate in a non-arbitrary way. While traditional labels like ‘ornative’, ‘privative’, ‘locative’, ‘instrumental’ and the like allow for a preliminary classification of denominal verbs, a more formal description has to account for at least three basic aspects, namely (1) competition among functionally similar word-formation patterns, (2) the polysemy of affixes, which precludes a neat one-to-one relation between derivatives displaying a particular affix and a particular semantic class, and (3) the relevance of generic knowledge and contextual information for the interpretation of (innovative) denominal verbs.

Derivational word-formation processes play an important role in the Germanic languages. In particular, prefixation and suffixation are highly productive. In accordance with the so-called right-hand head principle, suffixes tend to determine the morphological category of a word, and are therefore often category-changing (e.g., verb to noun), while prefixes can lead to changes regarding the valency or case government of the items to which they attach. Derivational patterns differ in various aspects, including the degree to which they modify the semantics of their bases and their morphological productivity.

Evaluative morphology is a field of linguistic studies that deals with the formation of diminutives, augmentatives, pejoratives, and amelioratives. Actually, evaluative constructions cross the boundaries of morphology, and are sometimes realized by formal strategies that cannot be numbered among word formation processes. Nevertheless, morphology plays a dominant role in the formation of evaluatives. The first attempt to draw an exhaustive account of this set of complex forms is found in the 1984 work Generative Morphology, by Sergio Scalise, who made the hypothesis that evaluatives represent a separate block of rules between inflection and derivation. This hypothesis is based on the fact that evaluatives show some properties that are derivational, others that are inflectional, and some specific properties that are neither derivational nor inflectional. After Scalise’s proposal, almost all scholars have tried to answer the question concerning the place of evaluative rules within the morphological component. What data reveal is that, in a cross-linguistic perspective, evaluatives display a uniform behavior from a semantic and functional point of view, but exhibit a wide range of formal properties. In other words, functional identity does not imply formal identity; consequently, we can expect that constructions performing the same function display different formal properties in different languages. So, if evaluatives are undoubtedly derivational in most Indo-European languages (even if they cannot be considered a typical example of derivation), they are certainly quite close to inflection in some Bantu languages. This means that the question about the place of evaluatives within the morphological component probably is not as crucial as scholars have thought, and that other issues, sometimes neglected in the literature, deserve the same attention. Among them, the role of pragmatics in the description of evaluatives is no doubt central. According to Dressler and Merlini Barbaresi, in their 1994 work, Morphopragmatics: Diminutives and Intensifiers in Italian, German and Other Languages, evaluative constructions are the more typical instantiation of morphopragmatics, which is “defined as the area of general pragmatic meanings of morphological rules, that is of the regular pragmatic effects produced when moving from the input to the output of a morphological rule.” Evaluatives include “a pragmatic variable which cannot be suppressed in the description of [their] meaning.” Another central issue in studies on evaluative morphology is the wide set of semantic nuances that usually accompany diminutives, augmentatives, pejoratives, and amelioratives. For example, a diminutive form can occasionally assume a value that is attenuative, singulative, partitive, appreciative, affectionate, etc. This cluster of semantic values has often increased the idea that evaluatives are irregular in nature and that they irremediably avoid any generalization. Dan Jurafsky showed, in 1996, that these different meanings are often the outcome of regular and cross-linguistically recurrent semantic processes, both in a synchronic and in a diachronic perspective.

Sino-Tibetan is a highly diverse language family, in which a wide range of morphological phenomena and profiles may be found. The family is generally seen as split into two major branches, i.e., Sinitic and Tibeto-Burman, but while Sinitic is a fairly homogeneous group in terms of morphology, the so-called Tibeto-Burman branch of the family includes isolating languages like Karen, languages with transparent and regular agglutinative morphology (Lolo-Burmese, Tibetic, and Boro-Garo), but also paradigmatically complex languages, with elaborate argument indexation and transitivity management systems; while in some languages morphological complexity is mostly a conservative trait (e.g., Rgyalrongic and Kiranti), other languages developed innovative paradigms, with only few vestiges of the archaic system (Kuki-Chin). Some notable morphological phenomena in modern Tibeto-Burman languages are verb stem alternation, peculiar nominalization constructions, and long sequences of prefixes, which in some languages (Chintang) may even be freely permutated without any relevant change in meaning. Also, while Sinitic languages are normally taken to be a prototypical example of the (ideal) isolating morphological type (with virtually no inflection, stable morpheme boundaries, no cumulative exponence, and no allomorphy or suppletion), phenomena of strong reduction of morphemes, blurring of morpheme boundaries and fusion between root and suffix, and nonconcatenative morphology, as well as allomorphy and (proto-)paradigmatic organization of morphology, are attested in some Chinese dialects, mostly concentrated in an area of Northern China (Shaanxi, Shanxi, Henan, Hebei, and Shandong provinces). Moreover, ‘Altaic-type’ agglutinative morphology, including case marking, is found in Sinitic languages of the so-called Qinghai-Gansu Sprachbund; in this case, the development of agglutination, as well as other typological traits (as SOV word order), is clearly the product of intense and prolonged contact between Northwestern Chinese dialects and Tibetic and Mongolic languages of China. On the other hand, Southern Chinese dialects have developed in closer contact with Hmong-Mien, Tai-Kadai, and Austroasiatic languages, and are thus closer to the typology of Mainland Southeast Asian languages, with a very strong isolating profile.

The scope of classical generative morphology is not clearly determined. All three components need clarification. The boundaries of what counts as generative linguistics are not unambiguously set, but it can be assumed that all generative work in linguistics is inspired by the work of Noam Chomsky. Morphology was a much more prominent component of linguistic theory in earlier approaches, but of course the subject field had to be accounted for also in generative linguistics. The label classical can be seen as restricting the scope both to the more mainstream approaches and to a period that ends before the present. Here, the early 1990s will be taken as the time when classical theorizing gave way to contemporary generative morphology. In the earliest presentations of generative linguistics, there was no lexicon. The introduction of the lexicon made many of the ideas formulated before obsolete. Chomsky’s Lexicalist Hypothesis provided the basis for a new start of research in morphology. Two contrasting elaborations appeared in the early 1970s. Halle proposed a model based on the combination of morphemes, Jackendoff one based on the representation and analysis of full words. Against this background, a number of characteristic issues were discussed in the 1970s and 1980s. One such issue was the form of rules. Here there was a shift from transformations to rewrite rules. This shift can be seen particularly well in the discussion of verbal compounds, e.g., truck driver. The question whether and how morphology should be distinguished from syntax generated a lot of discussion. Another broad question was the degree to which rules of morphology should be thought of as operating in separate components. This can be observed in the issue of the distinction of inflection and derivation and in level ordering. The latter was a proposal to divide affixes into classes with different phonological and other effects on the base they attach to. A side effect of level ordering was the appearance of bracketing paradoxes, where, for instance, generative grammarian has a phonological constituent grammarian but a semantic constituent generative grammar. Another aspect of rule application which can be constructed as a difference between morphology and syntax is productivity. In general, syntactic rules are more productive and morphological rules display blocking effects, where, for instance, unpossible is blocked by the existence of impossible. Being classical, much of the discussions in this period serves as a shared background for the emergence and discussion of current generative approaches in morphology. The transition to these theories started in the 1990s, although some of them appeared only in the early 2000s.

This article provides an overview of approaches to numerals within the field of morphology. As is well known, any strict separation between morphology, semantics and syntax is hardly feasible. However, to the extent possible, this study is focused on reviewing approaches to the structural properties of numerals much more than on studies of their uses or integration with other language units. A survey of the pertinent literature shows that there is an imbalance in the study of different kinds of numerals: cardinals have been studied in greater detail than any other kinds of numerals. The morpho-syntactic aspects of cardinal numerals have been discussed in a number of works but corresponding analyses remain in demand for most numeral derivatives, other than ordinals and distributives. Cardinal numerals have been shown to share features with some open word classes, most often with adjectives for the lower members of the set and with nouns for the higher members of the set. However, it has also been pointed out that cardinal numerals remain distinct from other word classes, and this distinction is best described in semantic terms. The use of cardinal numerals as sole or redundant markers of plurality is often related to semantic factors such as animacy and individuation, in some cases also to focus and referentiality. There are different views on whether cardinals in a phrase such as numeral noun should be regarded as heads or not. Among numeral derivatives, complex cardinals, distributive and ordinal numerals have been studied most. There is hardly any comparative work on other known numeral derivations such as multiplicatives, frequentatives, group numerals, approximatives. Currently ongoing projects highlight the cross-linguistic frequency of ordinals and distributives compared to other numerals as well as the need to discuss the basic-derived relation for all numeral derivatives and finally, the relation between numeral derivations and classifier systems on other numeral derivations. Other topics pertinent to the wider topics of numerals in morphology concern the analysis of more derivational patterns and way(s) numerals can be included there as well as operations of conversion whereby numerals are used for the expression of approximate quantities or non-numerical concepts.

The languages of Australia, generally recognized as falling into two groups, Pama-Nyungan and non-Pama-Nyungan, are remarkable for their phonological and morphological homogeneity. All Australian languages exhibit a range of suffixation for grammatical and derivational categories, typically with a high index of agglutination, along with widespread patterns of compounding and reduplication, in the latter case, often of unusual types. In some Pama-Nyungan languages, case suffixation forms complex constructions indexing multiple levels of relations within the clause and across clauses, including agreement of nouns with verbs for erstwhile cases which have developed into tense-aspect-modality systems. Non-Pama-Nyungan languages tend to have more elaborate verbal structures, including such features as incorporation of nouns and adverbs, cross-referencing of multiple participants, valence-changing morphology, and systems of noun class/gender agreement across the clause, typically of four to five classes. Many languages from both subgroups have complex predicate formations, which typically inhabit a region between phrasal and compound status. Finite verbs commonly inflect for a smallish number of tense-aspect-mood categories and can often be classified into a number of conjugation classes. Nouns by contrast rarely (if ever) inflect in patterns characteristic of declension classes in European languages. Words appear to be largely right-headed, based on the evidence of noun-adjective compounds. Gender/noun class systems in some languages have been co-opted by the case system to mark case relations, and in others to realize derivational meanings such as association or part-whole relations. Pronominal agreement systems in both PN and NPN languages can reach Baroque levels of complexity in incorporating distinctions based on social categories such as sibling, social category membership (such as moeity) and kinship. Bound pronominal agreement with a single argument is exceedingly rare: if there is a verbal or clitic agreement system, it almost always agrees with at least two arguments.

The aim of this article is to present the morphology and morphosyntax of Trans New Guinea (TNG) languages to a wide audience of linguists. The TNG languages are a family of several hundred languages spoken across much of the New Guinea mainland. The morphology of TNG languages shows a high degree of diversity, from mildly polysynthetic to almost isolating. Language data from virtually all subgroups of TNG can be found here, giving preference to recent descriptions and new data. TNG languages display a clear categorial divide between nouns and verbs. In terms of word formation, they typically allow N-N and V-V compounding. Category-changing derivational processes usually involve overt morphological means. TNG languages are rich in nominalization processes; verbalization processes are less common. Valency-changing derivational processes (causatives, applicatives) are widespread and involve affixation or verb serialization. Many TNG languages have a reduced inventory of verb roots, in extreme cases comprising only as few as 60 recorded roots. Serial verb constructions and light-verb constructions are used to increase the expressive power of the verb lexicon. Besides nouns and verbs, TNG languages have sizable classes of adjectives, small classes of adverbs, and pronouns, directionals, numerals, postpositions, and conjunctions. Nouns have restricted inflectional morphology, with inflection for the possessor being the most widespread. Nominal number is expressed less often and gender is very rare. Peripheral case roles are signaled by postpositions. Many TNG languages show optional ergativity where transitive subjects can be marked by a special case depending on certain semantic or pragmatic factors, such as animacy, agentivity, or focus. Verb morphology is extensive, yielding large paradigms. TNG languages use verbal affixes to express core arguments. Subjects are almost universally indexed with a suffix on the verb. The majority of TNG languages also index the object on the verb, either with a prefix or a suffix. The majority alignment pattern in the clause is accusative. Most TNG languages employ distinct constructions for bodily and mental processes, depending on whether they are controlled by an animate agent (e.g., think) or whether they are manifestations of a stimulus beyond the control of the experiencer (e.g., be angry). Tense, aspect, and mood categories can all be found in TNG languages with one of them usually being dominant. For the expression of aspect, serial verb constructions are common in which the last verb in the serialization has undergone grammaticalization into an aspect marker—for example, a progressive marker which has developed from the verb ‘stay’. In clause chains, almost all TNG languages distinguish between medial and final verbs. Medial verbs morphologically indicate co-reference or disjoint reference of key participants in the discourse, and final verbs provide morphosemantic information like tense, mood, or illocutionary force, which typically applies to the whole clause chain. Since this type of tracking system of continuity in discourse is highly characteristic of TNG in general and less common worldwide, it is treated in more detail here.

Affixation is the morphological process that consists of adding an affix (i.e., a bound morpheme) to a morphological base. It is cross-linguistically the most common process that human languages use to derive new lexemes (derivational affixation) or to adapt a word’s form to its morphosyntactic context (inflectional affixation). Suffixes (i.e., bound morphemes following the base) and prefixes (i.e., bound morphemes preceding the base) are the most common affixes, with suffixation being more frequently recorded in the world’s languages than prefixation. Minor types of affixation include circumfixation and infixation. Conversion and back-formation are related derivational processes that do not make use of affixation. Many studies have concentrated on the need to differentiate derivation from inflection, but these morphological processes are probably best described as two end points of a cline. Prototypically, derivation is used to change a word’s category (part of speech) and involves a semantic change. A word’s inflectional distinctions make up its paradigm, which amounts to the different morphological forms that correlate with different morphosyntactic functions. Form-function mapping in (derivational and inflectional) affixation is a key issue in current research on affixation. Many deviations from the canonical One Form-One Meaning principle can be observed in the field of affixation. From a diachronic point of view, it has been demonstrated that affixes often derive from free lexemes by grammaticalization, with affixoids being recognized as an intermediate step on this cline. More controversial, but still attested, is the opposite change whereby affixes and affixoids develop into free morphemes through a process of degrammaticalization.

Several factors influence children’s initial choices of word-formation options––simplicity of form, transparency of meaning, and productivity in current adult speech. The coining of new words is also constrained by general pragmatic considerations for usage: Reliance on conventionality, contrast, and cooperation between speaker and addressee. For children acquiring French, Italian, Portuguese, and Spanish, the data on what they know about word-formation for the coining of new words consist primarily of diary observations; in some cases, these are supplemented with experimental elicitation studies of the comprehension and production of new word-forms. The general patterns in Romance acquisition of word-formation favor derivation over compounding. Children produce some spontaneous coinages with zero derivation (verbs converted to nouns in French, for example) from as young as 2 years, 6 months (2;6). The earliest suffixes children put to use in these languages tend to be agentive (from 2;6 to 3 years onward), followed by instrumental, objective, locative, and, slightly later, diminutive. The only prefixes that emerge early in child innovations are negative ones used to express reversals of actions. Overall, the general patterns of acquisition for word-formation in Romance are similar to those in Semitic, where derivation is also more productive than compounding, rather than to those in Germanic, where compounding is highly productive, and emerges very early, before any derivational forms.

Grammaticalization is traditionally defined as the gradual process whereby a lexical item becomes a grammatical item (primary grammaticalization), which may be followed by further formal and semantic reduction (secondary grammaticalization). It is a composite change that may affect both phonological, morphological, syntactic, and semantic-pragmatic properties of a morpheme, and it is found in all the world’s languages. On the level of morphology, grammaticalization has been shown to have various effects, ranging from the loss of inflection in primary grammaticalization to the development of bound morphemes or new inflectional classes in secondary grammaticalization. Well-known examples include the development of future auxiliaries from motion verbs (e.g., English to be going to), and the development of the Romance inflection future (e.g., French chanter-ai ‘I sing’, chanter-as ‘you sing’, etc., from a verb meaning ‘to have’). Although lexical-grammatical change is overwhelmingly unidirectional, shifts in the reverse direction, called degrammaticalization, have also been shown to occur. Like grammaticalization, degrammaticalization is a composite change, which is characterized by an increase in phonological and semantic substance as well as in morphosyntactic autonomy. Accordingly, the effects on morphology are different from those in grammaticalization. In primary degrammaticalization new inflections may be acquired (e.g., the Welsh verb nôl ‘to fetch,’ from an adposition meaning ‘after’), and erstwhile bound morphemes may become free morphemes (e.g., English ish). As such effects are also found in other types of changes, degrammaticalization needs to be clearly delineated from those. For example, a shift from a minor to a major category (e.g., English ifs and buts) or the lexicalization of bound affixes (isms), likewise result in new inflections, but these are instantaneous changes, not gradual ones.

In Germanic languages, conversion is seen as a change in category (i.e., syntactic category, word class, part of speech) without (overt) affixation. Conversion is attested in all Germanic languages. The definition of conversion as transposition or as derivation with a so-called zero-affix, which is responsible for the word-class change, depends on the language-specific part-of-speech system as well as, as often argued, the direction of conversion. Different types of conversion (e.g., from adjective to noun) are attested in Germanic languages, which differ especially semantically from each other. Although minor conversion types are attested, the main conversion types in Germanic languages are verb-to-noun conversion (deverbal nouns), adjective-to-noun conversion (deadjectival nouns), and noun-to-verb conversion (denominal verbs). Due to the characteristics of word-class change, conversion displays many parallels to derivational processes such as the directionality of category change and the preservation of lexical and grammatical properties of the underlying stem such as argument structure. Some, however, have argued that conversion does not exist as a specific rule and is only a symptom of lexical relisting. Another question is whether two such words are related by a conversion process that is still productive or are lexically listed relics of a now unproductive process. Furthermore, the direction of conversion of present-day Germanic, for example, the identification of the word class of the input before being converted, is unclear sometimes. Generally, deverbal and deadjectival nominal conversion in Germanic languages is semantically more transparent than denominal and deadjectival verbal conversion: despite the occurrence of some highly frequent, but lexicalized counterexamples, the semantic impact of conversion is only sometimes predictable, slightly more in the nominal domain than in the verbal domain. The semantics of verb formation by conversion (e.g., whether conversion leads to causative readings or not) is hardly predictable. Overall, conversion in Germanic is considered a process with multiple linkages to other morphological phenomena such as derivation, back-formation, and inflectional categories such as grammatical gender. Due to the lack of formal markers, conversion is considered non-iconic. The different kinds of conversions are merely based on language-specific mechanisms, but what all Germanic languages share at least is the ability to form nominal conversion, which is independent of their typological characteristics as isolating-analytic versus inflectional-fusional languages. This is surprising given the crosslinguistic prevalence of verbal conversion in the languages of the world.

Neurolinguistic approaches to morphology include the main theories of morphological representation and processing in the human mind, such as full-listing, full-parsing, and hybrid dual-route models, and how the experimental evidence that has been acquired to support these theories uses different neurolinguistic paradigms (visual and auditory priming, violation, long-lag priming, picture-word interference, etc.) and methods (electroencephalography [EEG]/event-related brain potential [ERP], functional magnetic resonance imaging [fMRI], neuropsychology, and so forth).