Meaning of “orchestra” in the English Dictionary

"orchestra" in British English

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orchestranoun

uk /ˈɔː.kɪ.strə/ us /ˈɔːr.kə.strə/

orchestra noun (MUSIC)

B1 [ C, + sing/pl verb ] a large group of musicians who play many different instruments together and are led by a conductor:

She's a cellist in the City of Birmingham Symphony Orchestra.

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orchestra noun (THEATRE)

the orchestra [ S ] US UK the stalls

the seats on the main floor of a theatre or cinema, not at a higher level

orchestral
adjective uk /ɔːˈkes.trəl/ us /ɔːrˈkes.trəl/

B2

an orchestral arrangement

(Definition of “orchestra” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"orchestra" in American English

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orchestranoun [ C ]

us /ˈɔr·kə·strə, -kes·trə/

a large group of musicians playing different instruments and usually organized to play together and led by a conductor:

the New York Philharmonic Orchestra

The orchestra of a theater is the part on the main floor:

We’ve got seats in the fifth row of the orchestra.
orchestral
adjective [ not gradable ] us /ɔrˈkes·trəl/

an orchestral arrangement

(Definition of “orchestra” from the Cambridge Academic Content Dictionary © Cambridge University Press)