Lewis & Short

1. Nĕmĕsis, is and ĭos, f., = Νέμεσις, the goddess of justice, who punishes human pride and arrogance; also called Adrastea and Rhamnusia (v. h. vv.): ne poenas Nemesis reposcat a te, Cat. 50, 18: Graecam Nemesin invocantes, Plin. 28, 2, 5, § 22: post aurem Nemesios, id. 11, 45, 103, § 251.
Voc.: Nemesis, Aus. Idyll. 8, 41.
Sometimes identical with Fortuna: DEAE NEMESI SIVE FORTVNAE, Inscr. Grut. 80, 1.
Acc. to Macr. S. 1, 22, Nemesis is the Sun; acc. to Lact. 1, 21, 23, she is Leda, who was removed to heaven after her death.