Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Language: Latin
Origin: 'from what came before'

a priori

 adjective, adverb
     
a pri‧o‧ri formal
using previous experiences or facts to decide what the likely result or effect of something will be [↪ a posteriori]:
a ruling made on a priori grounds
Definition from the Longman Dictionary of Contemporary English
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