adjunct [Lat. adiungere ‘to connect, to add’]

Linguistic expression used attributively which semantically specifies either a preceding or a following element. This can be either restrictive through the use of an article, pronoun, relative clause, and the like (that/my book; the book that he is reading right now) or qualitative (an unusual book; that book over there). In contrast to complements, adjuncts are not grammatically required, that is, they are free adjuncts. ( also attribute)

1 In transformational grammar, an elementary syntactic operation through which constituents, after having been removed from their position in the deep structure, are inserted into a different position in the surface structure; they are linked to the tree diagram of the surface structure by an additional branch. ( also transformation, Chomskyadjunction)

2 A synonym for disjunction in formal logic.