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πεῖραν

Ὁ δ' ἀνεξέταστος βίος οὐ βιωτὸς ἀνθρώπῳ -> The unexamined life is not worth living
Plato, Apology of Socrates 38a

French (Bailly abrégé)

acc. sg. de πεῖρα.