LATIN DICTIONARYLexicon Latīnum
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“assertion” in Latin

The English word assertion itself goes back to Latin asserō, through assertiō.

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

assertion
affirmatio: asseveratio (both as an action): sententia (opinion): opinio: decretum: dogma (opinion of a school in philosophy). To retract an assertion, sententiam mutare: revocare. Vid: Assertio is the maintaining in a court of justice that a person is a free man or a slave.

Quick answer

What is the Latin word for assertion?
The usual Latin words for “assertion” are affirmātiō, assevērātiō, sententia; also opīniō, dēcernō, dogma. 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.