/rev"euh lee/ ; Brit. /ri val"ee/ , n.
1. a signal, as of a drum or bugle, sounded early in the morning to awaken military personnel and to alert them for assembly.
2. a signal to arise.
[ 1635-45; réveillez, pl. impv. of réveiller to awaken, equiv. to r ( e ) - RE- + éveiller, OF esveillier evigilare to watch, be vigilant ( e- E- + vigilare to watch; see VIGIL) ]