Vespers n. : One of the little hours of the Breviary.

Vespers n. : The evening song or service.

Example:
Bartenders! Since Casino Royale came out have you had people ordering Vespers?

Taxonomy
Vespers, psalms, Office, hymn, celebrant, assistants, feasts, prayer, Lucernarium, sings, the church, antiphons, Solemn Vespers, reading, service, cantors, Pss, l. c.

Defination from the web:
Vespers is the evening prayer service in the Western Catholic, Eastern (Byzantine) Catholic, and Eastern Orthodox, Anglican, and Lutheran liturgies of the canonical hours. ... Small Vespers is a very abbreviated form of the service which is celebrated only on the afternoon before an ...