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English definition of “orchestra”

orchestra

noun [C]  /ˈɔr·kə·strə, -kes·trə/ us  
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]  /ɔrˈkes·trəl/ us  
an orchestral arrangement
(Definition of orchestra from the Cambridge Academic Content Dictionary © Cambridge University Press)
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