LATIN DICTIONARYLexicon Latīnum
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“affirmation” in Latin

The English word affirmation itself goes back to Latin firmus, through affirmare.

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

affirmation
affirmatio.
Confirmation (Vid :) of a law, etc., confirmatio, auctoritas, fides.

Quick answer

What is the Latin word for affirmation?
The usual Latin words for “affirmation” are affirmātiō, cōnfirmātiō, auctōritās; also fidēs. 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.