
Subjacency is a general syntactic locality constraint on movement. It specifies restrictions placed on movement and regards it as a strictly local process. This term was first defined by Noam Chomsky in 1973 and constitutes the main concept of the Government and Binding Theory. The revised definition of subjacency from Chomsky (1977) is as follows...
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http://en.wikipedia.org/wiki/Subjacency

Subjacency is a restriction on grammatical MOVEMENT in the SENTENCE that prevents elements moving over more than one boundary, the definition of boundary varying as a PARAMETER from one language to another.
Found on
http://www.viviancook.uk/Linguistics/LinguisticsGlossary.htm
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