X-bar theory

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English[edit]

Alternative forms[edit]

Etymology[edit]

X signifies an arbitrary lexical category; certain structures are represented by this letter and an overbar.

Noun[edit]

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X-bar theory (uncountable)

  1. (linguistics) A theory that posits a common syntactic structure for different lexical categories. Each phrase (XP) is the projection of a head (X) and may optionally include a specifier (sister of X-bar, daughter of XP), adjuncts (sister and daughter of X-bar) and complements (sister of X, daughter of X-bar).

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