v.intr. (often foll. by between, in)
1. occur in time between events.
2 interfere; come between so as to prevent or modify the result or course of events.
3 be situated between things.
4 come in as an extraneous factor or thing.
5 Law interpose in a lawsuit as a third party.
Derivatives:
intervener n. intervenient adj. intervenor n.
Etymology: L intervenire (as INTER-, venire come)