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reveille (n.)

"signal given at break of day to soldiers and sentries" (originally by drum or bugle), 1640s, from French réveillez-vous "awaken!" imperative plural of réveiller "to awaken, to wake up," from re- "again" (see re-) + Middle French eveiller "to rouse," from Vulgar Latin *exvigilare, from Latin ex- "out" (see ex-) + vigilare "be awake, keep watch" (from PIE root *weg- "to be strong, be lively").

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Definitions of reveille from WordNet

reveille (n.)
(military) signal to wake up;
Synonyms: wake-up signal
reveille (n.)
a signal to get up in the morning; in the military it is a bugle call at sunrise;
From wordnet.princeton.edu