The choir or chancel of a church; = choir, n. 3.

That part of a church appropriated to the singers; spec. the part eastward of the nave, in which the services are performed, separated from the rest…

The part of a church building used by the choir of singers during services; = choir, n. 2a.

The action, practice, or art of singing psalms (or sacred vocal music in general, including hymns and anthems), esp. in public worship; †an act of…

the part of a church in which choir offices are performed.

That part of a cathedral or monastic church appropriated to the members of a choir. Cf. choir, n. 2a.