reveille

The sounding of a bugle early in the morning to awaken and summon people in a camp or garrison.

This bugle call or its equivalent.

The first military formation of the day.

A signal to get up out of bed.

Milit. and naval, the beat of a drum, bugle-sound, or other signal given about break of day, to give notice that it is time for the soldiers or sailors to rise and for the sentinels to forbear challenging.