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SYNTAX: one of the two types of movement operation, the other being substitution. Traditionally, there are two types of adjunction: Chomsky-adjunction, which results in a structure like (i), and sister-adjunction, which results in a structure like (ii). Both structures are the result of adjunction of X to Yi+1, but only in (i) the node adjoined to is doubled, or split into two segments to accommodate the adjoined element.

(i)	 Yi+1	        (ii)	 Yi+1
         /  \                   / | \
	X   Yi+1              X  Z  Yi+1
             / \
	    Z	Yi
Under the assumption of the binary branching constraint which rules out structures like (ii), sister-adjunction is not possible.
LIT. Chomsky, N. (1986b)
Chomsky, N. (1986b)
Kayne, R. (1984)