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“allege” in Latin

The English word allege itself goes back to Latin lēgō, through *exlītigāre.

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

allege
affirm, affirmare (to maintain as certain, affirm): assevarare (to affirm strongly). Observe, asserere is unclassical.
To bring forward evidence, etc., afferre testimonium: a passage, locum afferre: a reason, rationem, causam afferre: to allege anything as an excuse, excusare aliquid.

Quick answer

What is the Latin word for allege?
The usual Latin words for “allege” are affirmō, asserō, ratiō. 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.