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| 1. | a company of singers, esp. an organized group employed in church service. |
| 2. | any group of musicians or musical instruments; a musical company, or band, or a division of one: string choir. |
| 3. | Architecture.
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| 4. | (in medieval angelology) one of the orders of angels. |
| 5. | professed to recite or chant the divine office: a choir monk. |
| 6. | to sing or sound in chorus. |