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ἐχέμεν

Γελᾷ δ' ὁ μωρός, κἄν τι μὴ γέλοιον ᾖ -> The fool laughs even when there's nothing to laugh at
Menander

French (Bailly abrégé)

inf. prés. épq. de ἔχω.

Russian (Dvoretsky)

ἐχέμεν: эп. (= ἔχειν) inf. к ἔχω.