A priori (Latin, 'from the earlier') is a term used in philosophy and epistemology. Look up a priori in Wiktionary, the free dictionary. A priori or apriori may also refer to: A priori language, a type of constructed language A priori estimate, in the theory of partial differential equations A priori probability, a probability derived by deductive reasoning Apriori algorithm, an algorithm used with databases aPriori Capital Partners, a private equity investment firm Apriori Control (Apriori, LLC), later Reach-In, a technology company All pages with titles containing apriori All pages with titles containing a priori A posteriori (disambiguation) Priory, a monastery headed by a prior or prioress Ex-ante, a Latin phrase meaning 'before the event' This disambiguation page lists articles associated with the title A priori.If an internal link led you here, you may wish to change the link to point directly to the intended article.