Defn: One who intervenes; especially (Law), a person who assumes a part in a suit between others.

INTERVENIENCE; INTERVENIENCY
In`ter*ven"ience, In`ter*ven"ien*cy, n.

Defn: Intervention; interposition. [R.]

INTERVENIENT
In`ter*ven"ient, a. Etym: [L. interveniens, p. pr. of intervenire.]

Defn: Being or coming between; intercedent; interposed. [Obs.] Bacon.

INTERVENT
In`ter*vent", v. t. Etym: [See Intervene.]

Defn: To thwart; to obstruct. [Obs.] Chapman.

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

1. The act of intervening; interposition. Sound is shut out by the intervention of that lax membrane. Holder.

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. Sir W. Temple.