a signal, as of a drum or bugle, sounded early in the morning to awaken military personnel and to alert them for assembly.
a signal to arise.
Origin of reveille
1635–45; < Frenchréveillez, plural imperative of réveiller to awaken, equivalent to r(e)-re- + éveiller,Old Frenchesveillier ≪ Latinēvigilāre to watch, be vigilant (ē-e-1 + vigilāre to watch; see vigil)
1640s, from French réveillez-vous "awaken!" imperative plural of réveiller "to awaken, to wake up," from Middle French re- "again" (see re-) + eveiller "to rouse," from Vulgar Latin *exvigilare, from Latin ex- "out" + vigilare "be awake, keep watch" (see vigil).