C-command
(for constituent command) is relation that holds between a node
and its sister nodes and all the nodes that they dominate. The
basic definition is:
A node X c-commands a node Y, if the node that immediately dominates X also dominates Y.
C-command is useful in modification, antecedent-anaphor coindexation, government, and other functions.
In syntax c-command must be modified to read:
A node X c-commands a node Y, if the node that immediately dominates the maximal projection of X also dominates Y.
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