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functional projection

SYNTAX: The syntactic Xbar projection of a functional head, such as COMP (CP), INFL (IP), or Det (DP). The underlying assumption is that, like lexical heads N, A, V and P, functional heads have a syntactic projection as dictated by X-bar theory. A fundamental question is whether there is a limit to the number of functional categories. It seems reasonable to assume that their projection is in some sense parasitic on, or an extension of, a lexical projection.
LIT. Abney, S. (1987)
Chomsky, N. (1986b)
Ouhalla, J. (1990)