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κτᾶσθαι

Ὁ δὲ μὴ δυνάμενος κοινωνεῖν ἢ μηδὲν δεόμενος δι' αὐτάρκειαν οὐθὲν μέρος πόλεως, ὥστε ἢ θηρίονθεός → Whoever is incapable of associating, or has no need to because of self-sufficiency, is no part of a state; so he is either a beast or a god
Aristotle, Politics

French (Bailly abrégé)

inf. prés. de κτάομαι.

Dutch (Woordenboekgrieks.nl)

κτᾶσθαι inf. praes. van κτάομαι.

Greek > English (Woodhouse Verbs Reversed)

κτᾶσθαι = (see also κτάομαι, κτείνω): acquire, derive, obtain, secure, win for oneself

⇢ Look up "κτᾶσθαι" on Google | Wiktionary | LSJ full text search (Translation based on the reversal of Woodhouse's English to Ancient Greek dictionary)