tri ‧ o /ˈtriːəʊ $ ˈtriːoʊ/ BrE AmE noun ( plural trios ) [countable]
[ Date: 1700-1800 ; Language: French ; Origin: Italian , from tri- (from Latin ; ⇨ ↑ tri- ) ]
1 . a group of three people or things
trio of
He was met by a trio of smiling executives.
a classical guitar trio (=three musicians playing together)
2 . a piece of music for three performers
⇨ ↑ duet 1 , ↑ quartet