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αἴτιον

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

English (Abbott-Smith)

English (Strong)

neuter of αἴτιος; a reason or crime (like αἰτία): cause, fault.

Russian (Dvoretsky)

αἴτιον: τό причина Plat., Dem.