In`ter*ven"tion (?), n. [L. interventio an interposition: cf. F. intervention.]

1. The act of intervening; interposition.

Sound is shut out by the intervention of that lax membrane.

2. Any interference that may affect the interests of others; especially, of one or more states with the affairs of another; mediation.

Let us decide our quarrels at home, without the intervention, of any foreign power.

3. (Civil Law) The act by which a third person, to protect his own interest, interposes and becomes a party to a suit pending between other parties.

• the action of intervening; interfering in some course of events