Emily Dickinson Lexicon

RE-VEIL'LE, or RE-VEIL-LE', n. [or REV'EL-LY. Fr. reveiller, to awake; re and veiller, to watch; contracted from L. vigilo. See Watch.]

In military affairs, the beat of drum about break of day, to give notice that it is time for the soldiers to rise and for the sentinels to forbear challenging. – Encyc. [This word might well be anglicized rev'elly.]