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A PRIORI

 - 3 dictionary results

a pri⋅o⋅ri

[ey prahy-awr-ahy, -ohr-ahy, ey pree-awr-ee, -ohr-ee, ah pree-awr-ee, -ohr-ee]
–adjective
1. from a general law to a particular instance; valid independently of observation. Compare a posteriori (def. 1).
2. existing in the mind prior to and independent of experience, as a faculty or character trait. Compare a posteriori (def. 2).
3. not based on prior study or examination; nonanalytic: an a priori judgment.

Origin:
1645–55; < L: lit., from the one before. See a- 4 , prior


a⋅pri⋅or⋅i⋅ty [ey-prahy-awr-i-tee, -or-] , noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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a pri·o·ri   (ä' prē-ôr'ē, -ōr'ē, ā' prī-ôr'ī, -ōr'ī')   
adj.  
  1. Proceeding from a known or assumed cause to a necessarily related effect; deductive.

    1. Derived by or designating the process of reasoning without reference to particular facts or experience.

    2. Knowable without appeal to particular experience.

  2. Made before or without examination; not supported by factual study.


[Medieval Latin ā priōrī : Latin ā, from + Latin priōrī, ablative of prior, former.]
a' pri·o'ri adv., a' pri·or'i·ty (-ôr'ĭ-tē, -ŏr'-) n.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

a priori 
1710, "from cause to effect" (a logical term, in ref. to reasoning), from L., lit. "from what comes first," from priori, abl. of prior "first" (see prior (adj.)). Used loosely for "in accordance with previous knowledge" (1834).
Online Etymology Dictionary, © 2001 Douglas Harper
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