PRIMITIVE
(A situation, or state of affairs, or eventuality, is something that can occur in the world and that people can talk about.)
The term "situation" was used prominently by Comrie (1976) for this concept, but other terms are widespread, too. "Eventuality" is common in the formal semantics tradition (Bach 1986), and "state of affairs" was used by Dik (1997). Croft (2022) uses "event" as a cover term for actions and states.
event (a.k.a. eventuality, situation, SOA, state of affairs) (SEM) = a superordinate category including both action concepts and state concepts. The term ‘event’ has other meanings, including what we call a telic event. Other terms listed above are also used for ‘event’ as it is defined here. (Sections 2.1, 6.1.1)
"Situations are what natural language sentences are about: events or states (real or imaginary), involving entities, their properties, and their relations to one another." (Sag et al. 2003: 569)