Dene-Yeniseian is a putative family consisting of two branches: Yeniseian in central Siberia and Na-Dene (Tlingit-Eyak-Athabaskan) in northwestern North America. Yeniseian contains a single living representative, Ket, as well as the extinct Yugh, Kott, Assan, Arin, and Pumpokol languages. Na-Dene contains Tlingit, spoken mainly in the Alaskan Panhandle, and a second branch divided equidistantly between the recently extinct Eyak language of coastal Alaska and the widespread Athabaskan subfamily, which originally contained more than 40 distinct languages, some now extinct. Athabaskan was once spoken throughout interior Alaska (Dena’ina, Koyukon) and most of northwestern Canada (Slave, Witsuwit’en, Tsuut’ina), with enclaves in California (Hupa), Oregon (Tolowa), Washington (Kwalhioqua-Clatskanie), and the American Southwest (Navajo, Apache). Both families are typologically unusual in having a strongly prefixing verb and nominal possessive prefixes, but postpositions rather than prepositions. The finite verb arose from the amalgamation of an auxiliary and a main verb, both with its own agreement prefixes and tense-mood-aspect suffixes, creating a rigid, mostly prefixing template. The word-final suffixes largely elided in Yeniseian but merged with the ancient verb root in Na-Dene to create a series of allophones called stem sets. Na-Dene innovated a unique complex of verb prefixes called “classifiers” on the basis of certain inherited agreement and tense-mood-aspect markers; all of these morphemes have cognates in Yeniseian, where they did not innovate into a single complex. Metathesis and reanalysis of old morphological material is quite prevalent in the most ancient core verb morphology of both families, while new prefixal or suffixal slots added onto the verb’s periphery represent innovations that distinguish the individual daughter branches within each family. Other shared Dene-Yeniseian morphology includes possessive constructions, directional words, and an intricate formula for deriving action nominals from finite verb stems. Yeniseian languages have been strongly affected by the exclusively suffixing languages brought north to Siberia by reindeer breeders during the past two millennia. In modern Ket the originally prefixing verb has largely become suffixing, and possessive prefixes have evolved into clitics that prefer to attach to any available preceding word. Na-Dene languages were likewise influenced by traits prevalent across the Americas. Athabaskan, for example, developed a system of obviation in third-person agreement marking and elaborated an array of distinct verb forms reflecting the shape, animacy, number, or consistency of transitive object or intransitive subject. Features motivated by language contact differ between Tlingit, Eyak, and Athabaskan, suggesting they arose after the breakup of Na-Dene, as the various branches spread across northwestern North America. The study of Dene-Yeniseian morphology contributes to historical-comparative linguistics, contact linguistics, and also to the diachronic study of complex morphology. In particular, comparing Yeniseian and Na-Dene verb structure reveals the prominence of metathesis and reanalysis in processes of language change. Dene-Yeniseian is noteworthy not only for its wide geographic spread and for the effects of language contact on each separate family, but also for the opportunity to trace the evolution of uncommon morphological structures.
Morpheme ordering is largely explainable in terms of syntactic/semantic scope, or the Mirror Principle, although there is a significant residue of cases that resist an explanation in these terms. The article, we look at some key examples of (apparent) deviant ordering and review the main ways that linguists have attempted to account for them. Approaches to the phenomenon fall into two broad types. The first relies on mechanisms we can term “morphological,” while the second looks instead to the resources of the ‘narrow’ syntax or phonology. One morphological approach involves a template that associates each class of morphemes in the word with a particular position. A well-known example is the Bantu CARP (Causative-Applicative-Reciprocal-Passive) template, which requires particular orders between morphemes to obtain irrespective of scope. A second approach builds on the intuition that the boundary or join between a morpheme and the base to which it attaches can vary in closeness or strength, where ‘strength’ can be interpreted in gradient or discrete terms. Under the gradient interpretation, affixes differ in parsability, or separability from the base; understood discretely, as in Lexical Morphology and Phonology, morphemes (or classes of morphemes) may attach at a deeper morphological layer to stems (the stronger join), or to words (weaker join), which are closer to the surface. Deviant orderings may then arise where an affix attaches at a morphological layer deeper than its scope would lead us to expect. An example is the marking of case and possession in Finnish nouns: case takes scope over possession, but the case suffix precedes the possessive suffix. Another morphological approach is represented by Distributed Morphology, which permits certain local reorderings once all syntactic operations have taken place. Such operations may target specific morphemes, or morphosyntactic features characterizing a class of morphemes. Agreement marking is an interesting case, since agreement features are bundled as syntactically unitary heads but may in certain languages be split morphologically into separate affixes. This means that in the case of split agreement marking, the relative order must be attributed to post-syntactic principles. Besides these morphological approaches, other researchers have emphasized the resources of the narrow syntax, in particular phrasal movement, as a means for dealing with many challenging cases of morpheme ordering. Still other cases of apparently deviant ordering may be analyzed as epiphenomena of phonological processes and constraint interaction as they apply to prespecified and/or underspecified lexical representations.