Webster's English Dictionary

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choir

1. choir \'kwi-(-*)r\ n [ME quer, fr. OF cuer, fr. ML chorus, fr. L, 
   chorus] 1: an organized company of singers esp. in church service  2: a 
   group of instruments of the same class  3: an organized group of persons or 
   things  4: a division of angels  5: the part of a church occupied by the 
   singers or by the clergy; specif  : the part of the chancel between 
   sanctuary and nave 6: a group organized for ensemble speaking 
2. choir vb : to sing or sound in chorus or concert 
3. choir aj : of the class in a religious order bound to recite the Divine 
   Office and  devoted chiefly to the order's special work