Definition of

A Priori

  1. (adj, all) involving deductive reasoning from a general principle to a necessary effect; not supported by fact
  2. (adj, all) based on hypothesis or theory rather than experiment
  3. (adv, all) derived by logic, without observed facts

via WordNet, Princeton University

Antonyms of A Priori

a posteriori

Origin of the word A Priori

  1. 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

Words that sound like A Priori

abhor, abhorrer, abor, afar, affair, affaire, affray, afire, afro, apar, aper, aperea, apery, apiary, appear, appro, apr, au pair, aver, averrhoa, aviary, avower

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