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.
More examples
- The orchestra was conducted by Mira Shapur.
 - The orchestra is to perform its last ever concert tomorrow night at the Albert Hall.
 - The orchestra performed the Rite of Spring with great spirit.
 - The orchestra played superbly.
 - We admired the sureness of the orchestra's playing.
 
Thesaurus: synonyms and related words
Groups of musicians
- band
 - big band
 - boy band
 - brass band
 - chamber orchestra
 - duo
 - ensemble
 - gamelan
 - group
 - military band
 - octet
 - philharmonic
 - quartet
 - quintet
 - rhythm section
 - septet
 - sextet
 - string quartet
 - tribute band
 - trio
 
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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
Thesaurus: synonyms and related words
Theatre auditorium & front-of-house
- aisle
 - auditorium
 - balcony
 - booking office
 - box
 - box office
 - circle
 - dress circle
 - foyer
 - front
 - front-of-house
 - full house
 - god
 - house
 - house lights
 - mezzanine
 - mosh pit
 - out front idiom
 - pit
 - stall
 
orchestral 
adjective uk/ɔːˈkes.trəl/us/ɔːrˈkes.trəl/
B2
an orchestral arrangement