A priori and a posteriori are terms that are used especially in logic and philosophy. A priori is from Latin ā priōrī, which means literally, "from what is earlier."

Prior analytics (a priori) is about deductive logic, which comes from definitions and first principles. Posterior analytics (a posteriori) is about inductive logic, which comes from observational evidence.

A PRIORI definition: 1. relating to an argument that suggests the probable effects of a known cause, or using general…. Learn more.

An a priori argument, reason, or probability is based on an assumed principle or fact, rather than on actual observed facts. In the absence of such evidence, there is no a priori hypothesis to work with. …

“A priori” and “a posteriori” refer primarily to how, or on what basis, a proposition might be known. In general terms, a proposition is knowable a priori if it is knowable independently of experience, while …

Define a priori. a priori synonyms, a priori pronunciation, a priori translation, English dictionary definition of a priori. adj. 1. Proceeding from a known or assumed cause to a necessarily related effect; deductive.

What does a priori mean? A priori is a term applied to knowledge considered to be true without being based on previous experience or observation. In this sense, a priori describes knowledge that …

Dec 11, 2025 · Learned borrowing from Medieval Latin ā priōrī (“involving reasoning from cause to effect; from first principles”, literally “from the former”). a priori (comparative more a priori, superlative …

Definition of priori in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

4 BonJour, as do many, uses “a priori” adjectivally, although it has been correctly pointed out by R.P. Wolff and W.H. Werkmeister that Kant uses the term adverbially; hence, we should more precisely …