LATIN DICTIONARYLexicon Latīnum
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“piety” in Latin

The English word piety itself goes back to Latin pius, through pietās.

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

piety
pietas erga Deum (reverence and love toward God): sanctitas (course of life pleasing to God). (The words are found in this connection and order.) pietas et sanctitas; sanctimonia (virtuous disposition, innocence): to have credit for great piety, magna pietatis et sanctitatis laude florere.

Quick answer

What is the Latin word for piety?
The usual Latin words for “piety” are sānctitās, sānctimōnia. 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.