Pronunciation: (in"tur-vēn'),[key] —v.i.,-vened, -ven•ing. 1. to come between disputing people, groups, etc.; intercede; mediate.
2. to occur or be between two things.
3. to occur or happen between other events or periods: Nothing important intervened between the meetings. 4. (of things) to occur incidentally so as to modify or hinder: We enjoyed the picnic until a thunderstorm intervened. 5. to interfere with force or a threat of force: to intervene in the affairs of another country. 6. Law.to interpose and become a party to a suit pending between other parties.