Aequilíbritas, pen. cor. æquilibritâtis, pen. prod. Cic.Equalitie or likenesse of weight.
Lewis and Short: Latin dictionary
aequĭlībrĭtas, ātis, f. [aequilibris] (a word coined by Cic. as a transl. of the Epicurean isonomi/a), the equal distribution of the powers of nature: confugis ad aequilibritatem; sic enim i)snomi/an, si placet, appellemus, Cic. N. D. 1, 39, 109 (cf. id. ib. 19, 50, 1: i)sonomi/an appellat Epicurus, id est, aequabilem tributionem)