(adjective)Proceeding from a known or assumedcause to a necessarilyrelatedeffect;deductive.
(adjective)Derived by or designating the process of reasoning without reference to particularfacts or experience.
(adjective)Knowable without appeal to particularexperience.
(adjective)Madebefore or without examination;notsupported by factualstudy.
(adjective) relating to or involving deductive reasoning from a general principle to the expected facts or effects
(adjective) known to be true independently of or in advance of experience of the subject matter; requiring no evidence for its validation or support
Use "a priori" in a sentence
"Yet this rational group-formation can be disrupted under certain circumstances, since it is not of an a priori character."
"It seems impossible to deny an a priori fighting instinct, especially if one keeps in mind the incredibly picayunish, even silly, occasions of the most serious conflicts."
"As to whether it “certainly should not” mean this, does Mr. Slatin mean an a priori certainty deducible from the deep structure of the language itself or an observational certainty based on universally accepted, peer-reviewed, reproducible results obtained under controlled conditions?"