Illocution

The dimension of speech acts is called ‘ illocution’ and is characterized by the force which is behind the speaker’s words, so it is often paraphrased by ‘ illocutionary force ’.
Illocution - an act performed by a speaker by uttering certain words, for example, the acts of promising or threatening. Also called: the illocutionary act [Collins English Dictionary].

Illocution - an action performed by speaking or writing, for example, ordering, warning, or promising [Oxford Learner`s Dictionaries].

In linguistics, and more specifically pragmatics, an interpersonal act is performed by saying something in a sufficiently explicit form to be understood (in a relevant context) to have ‘conventional consequences.’ The most obvious examples employ performative or illocutionary verbs (describing the performance of an action): for example, promise, arrest, baptize. The definitive focus here is on a particular communicative purpose or function rather than on effects; recognition of the communicative intent is crucial [A dictionary of media and communication].

Conversely, illocutions are variable to the proposition of the locution depending on the context as well (cf. Bublitz p.89).

Sources:

Illocution. Collins English Dictionary. Retrieved from: https://www.collinsdictionary.com/dictionary/english/illocution

Illocution. Oxford Learner`s Dictionaries. Retrieved from: https://www.oxfordlearnersdictionaries.com/definition/english/illocution

Illocutionary act. A dictionary of media and communication. Retrieved from: https://www.oxfordreference.com/display/10.1093/oi/authority.20110803095957841;jsessionid=911F21C6EFA9B9759169EF0FCBCF7AF3