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Meaning of complementizer

com•ple•men•tiz•er

Pronunciation: (kom'plu-mun-tī"zur), [key]
— n. Ling.
  1. an element or elements marking a complement clause, as that in We thought that you forgot, for … to in For you to go all the way there would be silly, or possessive …-ing in Barbara's leaving so early worried them.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.