Last Updated：2025/11/26
(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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X-bar theory
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Source Word
X-bar theory
Noun
uncountable
(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).
Japanese Meaning
異なる語彙的カテゴリーに共通する統語構造を仮定する理論。各句（XP）は中心語（X）の拡張であり、付随的に限定語（Xバーの姉妹かつXPの構成部分）、修飾語（Xバーの姉妹または構成要素）および補語（Xの姉妹またはXバーの構成要素）を含むとされる。
Sense（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).
