ὀρχήστ-ρα · orchēst-ra — LSJ
orchestra, i.e. in the theatre the space on which the chorus danced, Arist. Pr. 901b30, SIG 577.31 (Milet., iii/ii B. C.), etc.: metaph., ὀ. πολέμου Plu. Apophth.reg. 2.193e.
part of the ἀγορά at Athens, Pl. Ap. 26e, cf. Tim. Lex., Phot.