orchestra UK /ˈɔː.kɪs.tɹə/US /ˈoɹ.kɪs.tɹə/ noun4 •a group of many people, led by one person in front, who play music togetherThe orchestra plays music for the dancers to dance to in the 19th century-styled dance hall. •The area in a theatre or concert hall where the musicians sit, immediately in front of and below the stage, sometimes (also) used by other performers. •A semicircular space in front of the stage used by the chorus in Ancient Greek and Hellenistic theatres. •A group of crickets.the jackhammering racket of the city softened and an orchestra of crickets trilled in unison — 2024 formsorchestrae · orchestras