n. A vesper hymn or song.n. The evening star, a name given to the planet Venus when she is east of the sun and appears after sunset; hence, the evening.n. plural [⟨ LL. vespera, ML. vesperæ, ⟨ vespera, evening.] In the Roman Catholic and Greek churches, and in religious houses and as a devotional office in the Anglican Church, the sixth or next to the last of the canonical hours.