adjective Philosophy, Linguistics.

pertaining to a linguistic act performed by a speaker in producing an utterance, as suggesting, warning, promising, or requesting.

Origin of illocutionary

First recorded in 1950–55; il-1 + locution + -ary
Related formsil·lo·cu·tion, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Word Origin and History for illocutionary

1955, from illocution + -ary.

Online Etymology Dictionary, © 2010 Douglas Harper