noun
speech act
Technical term in linguistics and philosophy of language, referring to an utterance that performs an action (e.g., promising, ordering, requesting).
「約束する」という発話は言語行為の一種です。
The utterance 'I promise' is a type of speech act.
Compound of 言語 (language) and 行為 (act, action), likely a calque from English 'speech act'.