ignōrantĭa (noun F) : ignorans, from ignoro
* Want of knowledge or information, ignorance (mostly post-Aug.; only once in Cic., for Cic. Fl. 20, 46, is a gloss; cf. Klotz,Cic. Lael. 19, 70; syn. ignoratio).
* With gen. obj.: ignorantia loci, * Caes. B. C. 3, 68, 2: locorum,Suet. Galb. 20; cf.: imperii Romani,Tac. A. 1, 59: scripturae,Suet. Calig. 41: discriminis sui,Quint. 6, 1, 47: praeteritae culpae,Ov. H. 20, 189: veri,id. M. 7, 92: recti,Tac. Agr. 1: bonarum rerum,Nep. Ages. 8, 5.
* Absol.: errorem et temeritatem et ignorantiam et opinationem et suspicionem ... a virtute sapientiaque removebat, * Cic. Acc. 1, 11, 42: hoc est maximum ignorantiae malum, quod, etc.,Quint. 12, 3, 3; 5, 10, 34; cf. id. 7, 2, 40; 7, 4, 14: mutua ignorantia fallentes,Tac. H. 1, 75: sancta ignorantia, quid sit illud quod, etc.,id. G. 40: ignorantiā lapsus,Plin. Ep. 10, 59; 10, 97, 1: si debitor meus manumisso dispensatori meo per ignorantiam solverit, liberari eum,Gai. Inst. 3, 160.

s. TLL