| 1. | a musical composition for three voices or instruments. |
| 2. | a company of three singers or players. |
| 3. | any group of three persons or things. |
| 4. | a subordinate division of a minuet, scherzo, march, etc., usually in a contrasted key and style (perhaps originally written for three instruments or in three parts). |
| TRIO Transplant Recipients International Organization |
trio
a musical composition for three instruments or voices, or a group of three performers.
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