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Title: M-command  
Author: World Heritage Encyclopedia
Language: English
Subject: Government and binding theory, Syntax, Command, Syntactic relationships, Noam Chomsky
Publisher: World Heritage Encyclopedia


In theoretical linguistics, m-command is a syntactic relation between two elements in a tree structure. It is a broader version of c-command, and like c-command, it is defined over the constituency-based trees associated with the phrase structure grammars (= constituency grammars) of the Chomskyan tradition (Government and Binding, Minimalist Program); it is therefore not applicable to the structures that other theories of syntax assume. For instance, it is not (or hardly) applicable to the dependency-based structures of dependency grammars. Aoun and Sportiche's (1983) definition of c-command in fact corresponds to what is now known as "m-command". Chomsky (1986) established the standard definition of m-command. If X and Y are two nodes in a syntactic tree, X m-commands Y if and only if:

The notion of maximal projection is adopted from X-bar theory. The difference between c-command and m-command is that X m-commands everything that it c-commands, and in addition, it m-commands the element in the specifier position of the phrase that it heads. M-command is used in the formulation of the syntactic relation government.


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