a company of singers, esp. an organized group employed in church service.

any group of musicians or musical instruments; a musical company, or band, or a division of one

string choir.

Architecture .

the part of a church occupied by the singers of the choir.

the part of a cruciform church east of the crossing.

(in medieval angelology) one of the orders of angels.

professed to recite or chant the divine office

a choir monk.

to sing or sound in chorus.