Pronunciation: (pur-fôr'mu-tiv), [key]
—adj. Philos., Ling.
(of an expression or statement) performing an act by the very fact of being uttered, as with the expression “I promise,” that performs the act of promising.
a performative utterance. Cf. constative.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.