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“ignorance” in Latin

The English word ignorance itself goes back to Latin ignōrō, through ignōrantia.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

ignorance
ignorantia: ignoratio (Cic. uses ignorantia once absolutely with temeritas, opinatio, etc., Acad., 1, 11; and as a blameable ignorance, Cic., Flacc., 20, 46, ignorantia litterarum [stronger than ignoratio, Reisig] is considered by Klotz an interpolation: Caes. has ignorantia loci [for which Cic. ignoratio locorum, and Caes., in another place, inscientia locorum]: ignoratio is very common in Cic., but only with genitive of the object): inscitia: inscientia (inscitia, from inscitus, is rather the want of skill, dexterity, etc., arisirig from want of practical knowledge: Reisig held that it could not be followed by the objective genitive of a substantive, but naturally might with genitive of gerund. He excepts Horace, who could not get inscientia into his verse: he is also forced to alter inscitia rerum, De Orat., 1, 22, 99; and inscitia temporis, De Off., 1, 40, 144. Livy has both temeritas atque inscientia ducum and temeritas atque inscitia: Velleius Paterculus, inscitia nostrorum ducum. Against Reisig is inscitia belli, though this may = belli gerendi, and inscitia temporis, which cannot well be explained temporis legendi or observandi. Tac. has inscitia legionum, reipublicae, etc.: Suet., inscitia artis, where, however, it may denote want of skill; Pliny, temporum; Quintilian, rerum verboramque; Vid: Hase ad Reisig, p. 118). Ignorance of the truth, ignoratio veritatis (Cic.). To confess one’s ignorance, fateri nescire, quod nescias: to confess one’s ignorance on many subjects, confiteri multa se ignorare: through ignorance, ignoratione (but only with genitive of the thing) [Vid: IGNORANTLY]. Anybody has not even the excuse of ignorance, alicui ne excusatio quidem est ignorantiae.

Quick answer

What is the Latin word for ignorance?
The usual Latin words for “ignorance” are ignōrō, ignōrātiō, īnscītia; also īnscientia, observō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.