English

Definition of a priori adjective from the Oxford Advanced Learner's Dictionary

 

a priori

 adjective,adverb
adjective, adverb
BrE BrE//ˌeɪ praɪˈɔːraɪ//
 
; NAmE NAmE//ˌeɪ praɪˈɔːraɪ//
 
(from Latin, formal)
 
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using facts or principles that are known to be true in order to decide what the probable effects or results of something will be, for example saying ‘They haven’t eaten anything all day so they must be hungry.’ an a priori assumption compare a posteriori Word Origin late 16th cent.: Latin, ‘from what is before’.
See the Oxford Advanced American Dictionary entry: a priori