[rev.eil.le] n [modif. of F reveillez, imper. pl. of reveiller to awaken, fr. MF reveiller, fr. re- + eveiller to awaken, fr. (assumed) VL exvigilare, fr. L ex- + vigilare to keep watch, stay awake--more at vigilant] (1644) 1: a signal to get up mornings
2: a bugle call at about sunrise signaling the first military formation of the day; also: the formation so signaled