Usage Note
Aseveración is a formal register noun for a confident statement presented as fact, stronger than a mere opinión but short of sworn testimony. It is used heavily in legal, journalistic, and academic prose; in everyday speech afirmación is more natural. The verb form is aseverar.
Examples
"La aseveración del testigo fue clave en el juicio."
Natural Translation
The witness's assertion was key at the trial.

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