a priori a priori /ə ˌpraɪˈɔraɪ/

adjective

1. Involving deductive reasoning from a general principle to a necessary effect; not supported by fact  ( a priori )
   involving deductive reasoning from a general principle to a necessary effect; not supported by fact
    An a priori judgment
   an a priori judgment
   
2. Based on hypothesis or theory rather than experiment  ( a priori )
   based on hypothesis or theory rather than experiment
   

adverb

1. Derived by logic, without observed facts  ( a priori )
   derived by logic, without observed facts