Definition of
A Priori
- (adj, all) involving deductive reasoning from a general principle to a necessary effect; not supported by fact
- (adj, all) based on hypothesis or theory rather than experiment
- (adv, all) derived by logic, without observed facts
via WordNet, Princeton University
Antonyms of A Priori
Origin of the word A Priori
- 1710, "from cause to effect" (a logical term, in ref. to reasoning), from L., lit. "from what comes first," from priori, abl. of prior "first" (see prior (adj.)). Used loosely for "in accordance with previous knowledge" (1834). more
via Online Etymology Dictionary, ©2001 Douglas Harper