peace n. 1 a quiet; tranquillity. b mental calm; serenity. 2 a (often attrib.) freedom from or the cessation of war (peace talks). b (esp. Peace) treaty of peace between States etc. at war. 3 freedom from civil disorder.  at peace 1 in a state of friendliness. 2 serene. 3 euphem. dead. hold one's peace keep silent. keep the peace prevent, or refrain from, strife. make one's peace (often foll. by with) re-establish friendly relations. make peace agree to end a war or quarrel. [Latin pax pac-]