n. The close of the day; the evening.n. The night or evening (often, and specifically in the Roman Catholic Church, the day and night) before certain holy days of the church, marked more or less generally by religious and popular observances.n. The period just preceding some specific event; a space of time proximate to the occurrence of something: as, the eve of a battle; on the eve of a revolution.To become damp.n. A hen-roost.