American English

Definition of a priori adjective from the Oxford Advanced American Dictionary


a priori

adjective, adverb
NAmE//ˌeɪ praɪˈɔraɪ//
, NAmE//ˌɑ priˈɔri//
(from Latin) (formal)
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using facts or principles that are known to be true in order to decide what the likely 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
See the Oxford Advanced Learner's Dictionary entry: a priori