a priori

[ ey prahy-awr-ahy, -ohr-ahy, ey pree-awr-ee, -ohr-ee, ah pree-awr-ee, -ohr-ee ]
/ ˌeɪ praɪˈɔr aɪ, -ˈoʊr aɪ, ˌeɪ priˈɔr i, -ˈoʊr i, ˌɑ priˈɔr i, -ˈoʊr i /


from a general law to a particular instance; valid independently of observation.Compare a posteriori(def 1).
existing in the mind prior to and independent of experience, as a faculty or character trait.Compare a posteriori(def 2).
not based on prior study or examination; nonanalytic: an a priori judgment.

Origin of a priori

1645–55; < Latin: literally, from the one before. See a-4, prior1

Related forms

a·pri·or·i·ty [ey-prahy-awr-i-tee, -or-] /ˌeɪ praɪˈɔr ɪ ti, -ˈɒr-/, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for apriority

British Dictionary definitions for apriority

a priori

/ (eɪ praɪˈɔːraɪ, ɑː prɪˈɔːrɪ) /


logic relating to or involving deductive reasoning from a general principle to the expected facts or effects
logic known to be true independently of or in advance of experience of the subject matter; requiring no evidence for its validation or support

Derived Forms

apriority (ˌeɪpraɪˈɒrɪtɪ), noun

Word Origin for a priori

C18: from Latin, literally: from the previous (that is, from cause to effect)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012