pertĭnācĭa (noun F) : pertinax
* Perseverance, constancy, in a good sense; and (more freq.) in a bad sense, obstinacy, pertinacity (syn.: perseverantia, pervicacia): dicitur quom demonstratur in quo non debet pertendi et pertendit, pertinaciam esse; in quo oportet manere, si in eo perstet, perseverantia sit,Varr. L. L. 5, § 2 Müll.; cf.: unicuique virtuti finitimum vitium reperietur, ut pertinacia, quae perseverantiae finitima est,Cic. Inv. 2, 54, 165; v. Att. ap. Non. 432, 32 sq.: certamen instituit non pertinaciā et studio vincendi, sed, etc.,Cic. Ac. 1, 12, 44: desistere pertinaciā,Caes. B. G. 1, 42: pertinaciae finem facere,id. B. C. 3, 10: muliebri pertinacia accendi,Tac. H. 4, 56: pertinaciam alicujus vincere,id. A. 2, 81.—In a good sense, Liv. 42, 62: patientia et pertinacia hostis,Suet. Caes. 68: in evitando inevitabili malo,Sen. Q. N. 4, praef. 12: auctorum pertinacia,steadfast opinion,Plin. 37, 3, 13, § 52.—Personified, the sister of Aether and Dies, Cic. N. D. 3, 17, 44.

s. TLL