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From The Collaborative International Dictionary of English v.0.48:
Reveille \Re*veil"le\, n. [F. r['e]veil, fr. r['e]veiller to awake; pref. re- re- + pref. es- (L. ex) + veiller to awake, watch, L. vigilare to watch. The English form was prob. taken by mistake from the French imper. r['e]veillez,2d pers. pl. See Vigil.] (Mil.) The beat of drum, or bugle blast, about break of day, to give notice that it is time for the soldiers to rise, and for the sentinels to forbear challenging. "Sound a reveille." --Dryden. [1913 Webster] For at dawning to assail ye Here no bugles sound reveille. --Sir W. Scott. [1913 Webster]