/ ˈkwaɪə(r); NAmE / noun
1.
[ C +sing./pl. v . ] a group of people who sing together, for example in church services or public performances :
She sings in the school choir.
2.
[ C ] the part of a church where the choir sits during services
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WORD ORIGIN
Middle English quer , quere , from Old French quer , from Latin chorus (denoting a character speaking the prologue of a play), from Greek khoros . The spelling change in the 17th cent. was due to association with Latin chorus and modern French choeur .