LATIN DICTIONARYLexicon Latīnum
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“perfection” in Latin

The English word perfection itself goes back to Latin perficiō, through perfectiō.

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

perfection
integritas (completeness): absolutio: perfectio. (The words are found in this connection and order.) absolutio perfectioque (highest degree of finish): perfection of virtue, virtus perfecta cumulataque: moral perfection, perfectum honestum: to attain perfection, ad perfectionem pervenire: ad summa venire: to bring a thing to perfection, aliquid absolvere, or perficere, or absolvere et perficere.

Quick answer

What is the Latin word for perfection?
The usual Latin words for “perfection” are integritās, absolūtiō, perfectiō; also perficiō. 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.