reveille
Concise Oxford English Dictionary © 2008 Oxford University Press:
reveille /rɪˈvali/
▶noun a military waking signal sounded especially on a bugle or drum.
– origin C17: from Fr. réveillez! ‘wake up!’, imper. pl. of réveiller, based on L. vigilare ‘keep watch’.
'reveille' also found in these Oxford entries:

