A vigil is a period of purposeful sleeplessness, an occasion for devotional watching, or an observance.

The word derives from the Latin vigilia meaning "wakefulness" (Greek: pannychis, ???????? or agrypnia ????????), and the Italian word vigilia has become generalized in this sense and means "eve" (as in "on the eve of the war").

Eves of religious celebrations

A vigil may be held on the eve

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