βέλτιστος

η, ον, Adv.
A. best, most excellent, β. ἀνὴρ γενενῆσθαι περὶ τὸν δῆμον Ar. Eq. 765; ὦ βέλτιστε or β., a common mode of address, my dear friend, Id. Pl. 1172, Antiph. 289, Pl. R. 337e, etc.; ὦ βέλτιστε σύ Eub. 106; ὦ β. ἀνδρῶν Pl. Grg. 515a; ὦ ἄριστε καὶ β. Id. Lg. 902a; βέντισθ’ οὗτος Theoc. 5.76; ὑπὲρ τὸ β. A. Ag. 378; οἱ β. or τὸ β. the aristocracy, X. HG 5.2.6, Cyr. 8.1.16, Ath. 1.5, etc.; τὸ β., in Philos., the highest good, Pl. Phd. 99a, 99b, Epict. Ench. 51, etc.; τὰ β. βουλεύειν Th. 4.68; οὐκ ἀπὸ τοῦ β. ἀναστρέφεσθαι SIG 593.7 (ii B. C.), PTeb. 282.8 (ii A. D.). Adv. βέλτιστα X. Oec. 7.29, etc.; βελτίστως Simp. in Cael. 419.25.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
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