From the Oxford Dictionary of English Grammar:

illocution
Linguistics. An act effected by a speaker by the very fact of making an utterance, in that the stating, inquiring, requesting, commanding, or inviting itself constitutes an action; the communicative function of an utterance.

illocutionary (for illocutionary force, see the quotation of 1955)

The term derives from J. L. Austin's Speech-Act Theory, where it contrasts with LOCUTION (the act of making a referentially meaningful utterance) and PERLOCUTION (concerned with an addressee's response to the speaker's illocution). It is thus central to discussions of the social and interpersonal meaning of language behaviour, and has gained wider currency than the other two terms.

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