What is the prefix of intervene and its meaning?

Answer 1

To come between, or to be between, persons or things; -- followed by between; as, the Mediterranean intervenes between Europe and Africa., To occur, fall, or come between, points of time, or events; as, an instant intervened between the flash and the report; nothing intervened ( i. e., between the intention and the execution) to prevent the undertaking., To interpose; as, to intervene to settle a quarrel., In a suit to which one has not been made a party, to put forward a defense of one's interest in the subject matter., To come between., A coming between; intervention; meeting.

Answer 2

Intervene - to take part in something so as to prevent or alter a result or course of events.