M-command

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In generative grammar and related frameworks, m-command is a syntactic relation between two nodes in a syntactic tree. A node $X$ m-commands a node $Y$ if the maximal projection of $X$ dominates $Y$ , but neither $X$ nor $Y$ dominates the other.

In government and binding theory, m-command was used to define the central syntactic relation of government. However, it has been largely replaced by c-command in current^[vague] research. M-command is a broader relation than c-command, since a node m-commands every node that it c-commands, as well as the specifier of the phrase that it heads. Like c-command, m-command is defined over constituency-based trees and plays no role in frameworks which adopt a different notion of syntactic structure.

References

Aoun, Joseph; Dominique Sportiche (1983). "On the Formal Theory of Government". Linguistic Review. 2 (3): 211–236. doi:10.1515/tlir-1983-020303.
Chomsky, Noam (1986). Barriers. Cambridge, MA: MIT Press.

Formal semantics (natural language)

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Formal systems	Alternative semantics Categorial grammar Combinatory categorial grammar Discourse representation theory (DRT) Dynamic semantics Generative grammar Glue semantics Inquisitive semantics Intensional logic Lambda calculus Mereology Montague grammar Segmented discourse representation theory (SDRT) Situation semantics Supervaluationism Type theory TTR
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