Definition
The degree of synthesis refers to the morpheme-to-word ratio. Languages with more than one morpheme per word are synthetic. Polysynthetic languages lie at the extreme end of the synthesis continuum with a very high number of morphemes per word (at the other extreme are isolating or analytic languages with only one morpheme per word). These highly synthetic languages often have very long words that correspond to complete sentences in less synthetic languages.
Many, if not most, languages regarded as polysynthetic include agreement with object arguments as well as subject arguments in verbs. Incorporation (primarily noun incorporation) has been an issue that has historically been confused with polysynthesis and also used as a criterion for its definition. Incorporation refers to the phenomenon where lexical morphemes (or lexemes) are combined together to form a single word. Not all polysynthetic languages are incorporating, and not all incorporating languages are polysynthetic.
Another common feature of Polysynthetic languages is a tendency to use head marking as a means of syntactic cohesion. This means that many polysynthetic languages mark grammatical relations between verbs and their constituents by indexing the constituents on the verb with agreement morphemes, and the relation between noun phrases and their constituents by marking the head noun with agreement morphemes. There are some dependent-marking languages that may be considered to be polysynthetic because they use case stacking to achieve similar effects, and very long words.
Benjamin Lee Whorf proposed a distinction between oligosynthetic and polysynthetic languages, where the former term was applied to languages with a very small number of morphemes of which all other lexical units are composed. No language has been shown to fit the description of an oligosynthetic language and the concept is not in general use in linguistics.
Mark C. Baker has tried to define polysynthesis as a syntactic macroparameter within Noam Chomsky's "principles and parameters" programme. He defines polysynthetic languages as languages that conform to the syntactic rule that he calls the "polysynthesis parameter", and that as a result show a special set of morphological and syntactic properties. The polysynthesis parameter states that all phrasal heads must be marked with either agreement morphemes of their direct argument or else incorporate these arguments in that head. This definition of polysynthesis leaves out some languages that are commonly stated as examples of polysynthetic languages (such as Inuktitut), but can be seen as the reason for certain common structural properties in others, such as Mohawk and Nahuatl. Baker's definition, probably because of its heavy dependence on Chomskyan theory, has not been accepted as a general definition of polysynthesis.
Read more about this topic: Polysynthetic Language
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