intervention; mediation

That intervenes or mediates. / Falling between two periods or events.

present participle of intervene

plural of intervening

(intransitive) To become involved in a situation, so as to alter or prevent an action. / (intransitive) To occur, fall, or come between, points of time, or events.

simple past tense and past participle of intervene

Third-person singular simple present indicative form of intervene

One who intervenes.

plural of intervener

(anatomy, botany) Between veins.