a priori a involving deductive reasoning from a general principle to a necessary effect; not supported by fact s based on hypothesis or theory rather than experiment r derived by logic, without observed facts Antonym(s) a_posteriori
News & Articles a priori Session Recap: USD and Aussie climb ahead of G-8; Yen and Euro weaken FXstreet.com (Barcelona) - A priori expected another quiet session in the Asia-Pacific ahead of the... For more information, read our latest forex news. June 17, 2013 - The Forex Market