πρεσβύτατος

From LSJ

πῶς δ' οὐκ ἀρίστη; τίς δ' ἐναντιώσεται; τί χρὴ γενέσθαι τὴν ὑπερβεβλημένην γυναῖκα; (Euripides' Alcestis 152-54) → How is she not noblest? Who will deny it? What must a woman have become to surpass her?

Source

English (Woodhouse)

(see also: πρέσβυς) first in importance, first-born

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Lexicon Thucydideum

natu maximus, the eldest, 1.20.2, 1.105.5, 2.13.7. 2.78.3. 6.54.2. 6.55.1. 6.55.1
antiquissimus, maximi momenti, most ancient, of greatest importance, 4.61.6.