LATIN DICTIONARYLexicon Latīnum
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“affirm” in Latin

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

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

affirm
aio (opposed to nego: absolutely or with accusative and infinitive): affirmare (assert that something is so): confirmare (affirm and support the assertion by reasons).
Confirm a contract, law, judgment, etc., sancire (pactum, legem. etc.); alicujus rei auctorem fieri (e.g., legis; of its reception by the Senate); ratum facere, efficere; ratum esse jubere. (Vid: CONFIRM.)

Quick answer

What is the Latin word for affirm?
The usual Latin words for “affirm” are aiō, affirmō, cōnfirmō; also sanciō, efficiō, pangō. 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.