aequum
From LSJ
τὸν αὐτὸν ἔρανον ἀποδοῦναι → pay him back in his own coin, repay him in his own coin, pay someone back in their own coin, pay back in someone's own coin, give tit for tat, pay back in kind
Latin > English
aequum aequi N N :: level ground; equal footing/terms; what is right/fair/equitable, equity
Latin > French (Gaffiot 2016)
æquum,⁹ ī, n., pris substt, v. æquus.