LATIN DICTIONARYLexicon Latīnum
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“purity” in Latin

The English word purity itself goes back to Latin pūrus, through puritas.

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

purity
Cleanness, munditia: mundities (☞ puritas does not occur in the best prose).
In a moral sense, integritas (unspotted character): castitas, castimonia (chastity): sanctitas (holiness).
(Of language)(Of language), integritas (incorrupti sermonis integritas; Cic.): munditia or mundities verborum, or orationis; castitas; sinceritas. Cf.., Not puritas; but the adjective, purus is used, pura oratio, etc. Vid: PURE (of language).

Quick answer

What is the Latin word for purity?
The usual Latin words for “purity” are munditia, munditiēs, integritās; also castitās, castīmōnia, sānctitās. 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.