Lewis Short
persĕvērantĭa (noun F) : persevero
* Steadfastness, constancy, perseverance (syn. pertinacia): perseverantia est in ratione bene consideratā stabilis et perpetua permansio,Cic. Inv. 2, 54, 164; id. Phil. 7, 5, 14: disputandum est, aliud an idem sit pertinacia et perseverantia,id. Part. Or. 19, 65: nautarum,Caes. B. C. 3, 26; Vulg. 2 Macc. 14, 38.
* Transf., objectively, long continuance, tediousness: belli,Just. 3, 4, 4.
Charlton T. Lewis, Charles Short, A Latin Dictionary