ὄρχ-ησις · orch-ēsis — LSJ
dancing, the dance, Epich. 171 ; ἐς ὄρχησιν ἀνίστασθαι Hdt. 1.202 ; esp. pantomimic dancing, Id. 6.129 ; δεινὰ ἐποιοῦντο πάσας τὰς ὀ. ἐν ὅπλοις εἶναι X. An. 6.1.11 ; ἐκπονεῖν Plb. 4.20.12 : a part of ἡ γυμναστική, acc. to Pl. Lg. 795e ; ἡ ἐν τοῖς ὅπλοις ὄ. Id. Cra. 406d ; ὄ. ἐνόπλιος, ἐναγώνιος ὄ., Luc. Salt. 8, 32, POxy. 1241 v 27 (ii A. D.), etc.; περὶ Ὀρχήσεως, title of work by Lucian ; cf. Ath. 1.14dsq., 14.630bsqq., Poll. 4.95 sq.