the act or a period of watching or surveillance; a watch
the act or a period of keeping awake at times when sleep is customary; a period of wakefulness
a devotional watch formerly kept on the night before a religious festival
the day before a religious festival, observed as a day of spiritual preparation
[Middle English vigile via French from late Latin vigilia watch on the eve of a feast, from Latin vigilia wakefulness, watch, from vigil awake, watchful]