1. (noun)vigil a period of sleeplessness Synonyms: watch
2. (noun)vigil, watch the rite of staying awake for devotional purposes (especially on the eve of a religious festival) Synonyms: spotter, scout, lookout man, lookout, watch, picket, ticker, vigil, sentinel, sentry
3. (noun)watch, vigil a purposeful surveillance to guard or observe Synonyms: spotter, scout, lookout man, lookout, watch, picket, ticker, vigil, sentinel, sentry