1. ἀμφότερος · amphoteros — LSJ
either, i.e. both of two (opp. ἑκάτερος each one of two), ἀμφοτέρας κοινὸν αἴας common to either land, A. Pers. 131; ποίημα ἢ πάθος ἢ ἀμφότερον or partaking of both, Pl. Sph. 248d; τὸ ἀμφότερον ἑκατέρῳ οὐχ ἕπεται Id. Hp.Ma. 302e.
Hom. has sg. only neut. ἀμφότερον as Adv., foll. by τε . . καί; ἀ. βασιλεύς τʼ ἀγαθὸς κρατερός τʼ αἰχμητής both together, prince as well as warrior, ib. 3.179; ἀ. γενεῇ τε καὶ οὕνεκα . . Il. 4.60; foll. by τε . . δέ . . , Pi. P. 4.79: also neut. pl., ἀμφότερα μένειν πέμπειν τε A. Eu. 480; φιλοχρήματος καὶ φιλότιμος, ἤτοι τὰ ἕτερα τούτων ἢ ἀ. Pl. Phd. 68c; ἀ. ἄριστος καὶ στρατηγὸς καὶ ῥαψῳδός Ion 541b; by τε . . καί . . , Pi. O. 1.104.
dual in Hom., as ἀ. Αἴαντε Il. 12.265, al., less freq. in later writers, X. An. 1.1.1, Pl. Prm. 143c, Isoc. 4.134, etc.; but pl. is much more freq., and is found with a dual Noun, χεῖρε πετάσσας ἀμφοτέρας Il. 21.115.—Phrases: κατʼ ἀμφότερα on both sides, Hdt. 7.10.βʹ, Pl. Prm. 159a; ἐπʼ ἀμφότερα towards both sides, both ways, Hdt. 3.87, al., Th. 1.83, al.; ἀμφότερα, abs., on both sides, ib. 13, al.; ἀπʼ ἀμφοτέρων from or on both sides, Ξέρξεω ἀπʼ ἀ. ἀδελφεός Hdt. 7.97; παρʼ ἀμφοτέρων D.S. 16.7,
later, of more than two, all together, Act. Ap. 19.16, PLond. 2.336.13 (ii A.D.).