An a priori assumption is an assumption that is presumed to be true without any assessment of the facts or without further proof. A priori is a Latin term that refers to a theoretical deduction made on a subject without a precise and detailed observation of the objective elements at hand. On the contrary, a posteriori refers to the reasoning that stems from the observation of known facts or past events, rather than the making of an a priori assumption or prediction, i.e. before conducting such observation.
[Last updated in November of 2021 by the Wex Definitions Team]
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