choir 
(kwīr)
(kwīr)n.
1. An organized company of singers, especially one performing church music or singing in a church.
2.
a. The part of a church used by such a company of singers.
b. The part of the chancel in a cruciform church that is occupied by this company of singers.
3.
a. A group of instruments of the same kind: a string choir.
b. A division of some pipe organs, containing pipes suitable for accompanying a choir.
4. An organized group: a choir of dancers.
5. One of the orders of angels.
intr.v. choired, choir·ing, choirs
To sing in chorus.
[Middle English quer, quire, from Old French cuer, from Medieval Latin chorus, from Latin, choral dance; see CHORUS.]