LATIN DICTIONARYLexicon Latīnum
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“allegation” in Latin

The English word allegation itself goes back to Latin allegō, through allegatio.

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

allegation
sententia (opinion): indicium, signilicatio (declaration of a witness): testimonium (allegations of a witness): of witnesses, authorities, etc., prolatio: commemoratio: affirmatio (assertion of a fact).
Plea, excuse, excusatio: causa (reason alleged).

Quick answer

What is the Latin word for allegation?
The usual Latin words for “allegation” are sententia, indicium, testimōnium; also excūsātiō, causa, prōlātiō. 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.