Acts that commit the speaker to future action, like promising or vowing.
A sentence like "It's locked" has a basic meaning because it is usable to perform the act of asserting that something is locked. Illocutionary Acts and Sentence Meaning
Illocutionary Acts and Sentence Meaning by William P. Alston Acts that commit the speaker to future action,
Acts like stating, describing, or predicting that something is the case. Alston Acts like stating, describing, or predicting that
'ing). When a speaker utters a sentence, they take responsibility for certain conditions being true (e.g., in a request to open a window, the speaker is responsible for the condition that the window is actually closed). Taxonomy of Speech Acts
Alston’s central thesis is that for a sentence to have a particular meaning is for it to be to perform illocutionary acts of a matching type.