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Definition of “trio” - English Dictionary

"trio" in American English

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trionoun [C]

us   /ˈtri·oʊ/ plural trios
three people who sing or play musical instruments together, or a piece of music written for three people
(Definition of trio from the Cambridge Academic Content Dictionary © Cambridge University Press)

"trio" in British English

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uk   /ˈtriː.əʊ/ us   /ˈtriː.oʊ/ plural trios
C2 [C, + sing/pl verb] a group of three people or things: There was disappointment for the trio of 200 metre runners, all of whom failed to reach the final.
[C, + sing/pl verb] a group of three musicians or singers who perform together: Many jazz trios consist of piano, guitar, and double bass.
[C] a piece of music that has been written to be performed by three people: The final item on today's programme is Beethoven's Trio in B flat.

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(Definition of trio from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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