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Meaning of factive

fac•tive

Pronunciation: (fak'tiv), [key]
— Ling. Ling.
—adj.
  1. (of a verb, adjective, or noun phrase) presupposing the truth of an embedded sentence that serves as complement, as realize in I didn't realize that he had left, which presupposes that it is true that he had left.
—n.
  1. a factive expression.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.