Ἀχαιός
Τὸ νικᾶν αὐτὸν αὑτὸν πασῶν νικῶν πρώτη τε καὶ ἀρίστη. Τὸ δὲ ἡττᾶσθαι αὐτὸν ὑφ' ἑαυτοῦ πάντων αἴσχιστόν τε ἅμα καὶ κάκιστον. → Τo conquer yourself is the first and best victory of all, while to be conquered by yourself is of all the most shameful as well as evil
English (LSJ)
ά, όν,
A Achaean, Hom., etc.: hence as Subst., 1 Ἀχαιοί, οἱ, the Achaeans, in Hom. for the Greeks generally, Il.2.235, etc. 2 Ἀχαΐα, ἡ, Achaia in Peloponnese, Th., etc.; under the Romans, the prouince of Greece.
Greek (Liddell-Scott)
Ἀχαιός: -ά, -όν, ὁ ἐξ Ἀχαίας, Λατ. Achivus, Ὅμ., κλ.· ἐντεῦθεν ὡς οὐσιαστ., 1) Ἀχαιοί, οἱ παρ’ Ὁμ. ἀντὶ τοῦ Ἕλληνες ἐν γένει, κυρίως δὲ Σπαρτιᾶται καὶ Ἀργεῖοι, Παυσ. 7. 1. 2) Ἀχαΐα, ἡ, ἐν Πελοποννήσῳ, Θουκ. κλ., ἀλλλ’ ὑπὸ τοὺς Ρωμαίους περιελάμβανεν ἅπασαν τὴν Ἑλλάδα, πλὴν τῆς Θεσσαλίας.