Definition of a priori

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a pri·o·ri    (ä pr-ôr, -r, pr-ôr, -r) KEY 

ADJECTIVE:

1. Proceeding from a known or assumed cause to a necessarily related effect; deductive.
2. 1. Derived by or designating the process of reasoning without reference to particular facts or experience.
   2. Knowable without appeal to particular experience.
3. Made before or without examination; not supported by factual study.

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ETYMOLOGY:
Medieval Latin prir : Latin , from + Latin prir, ablative of prior, former

OTHER FORMS:
a pri·ori(Adverb), a pri·ori·ty  (-ôr-t, -r-) KEY (Noun)