of or having to do with performance; specif., designating or having to do with a statement that functions as an action and, hence, is neither true nor false: “I apologize” is a performative utterance
See performative in American Heritage Dictionary 4
adjective
Relating to or being an utterance that peforms an act or creates a state of affairs by the fact of its being uttered under appropriate or conventional circumstances, as a justice of the peace uttering I now pronounce you husband and wife at a wedding ceremony, thus creating a legal union, or as one uttering I promise, thus performing the act of promising.