ἑκούσιον

From LSJ

ἰσότης φιλότητα ἀπεργάζεται → equality leads to friendship

Source

English (Strong)

neuter of a derivative from ἑκών; voluntariness: willingly.

Russian (Dvoretsky)

ἑκούσιον: τό свободная воля Plat., Arst.