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ratiocination

 - 3 dictionary results

ra⋅ti⋅oc⋅i⋅na⋅tion

  [rash-ee-os-uh-ney-shuhn, -oh-suh-, rat-ee-]
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–noun
the process of logical reasoning.
Origin:
1520–30; < L ratiōcinātiōn- (s. of ratiōcinātiō), equiv. to ratiōcināt(us) (see ratiocinate ) + -iōn- -ion

Related forms:
ra⋅ti⋅oc⋅i⋅na⋅tive, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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ra·ti·oc·i·nate   (rāsh'ē-ŏs'ə-nāt')   
intr.v.   ra·ti·oc·i·nat·ed, ra·ti·oc·i·nat·ing, ra·ti·oc·i·nates
To reason methodically and logically.

[Latin ratiōcinārī, ratiōcināt-, from ratiō, calculation; see ratio.]
ra'ti·oc'i·na'tion n., ra'ti·oc'i·na'tor 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

ratiocination 
"process of reasoning," 1530, from L. ratiocincationem (nom. ratiocincatio) "a reasoning," from ratiocincatus, pp. of ratiocinare "to calculate, deliberate," from ratio (see ratio) + -cinari, which probably is related to conari "to try."
Online Etymology Dictionary, © 2001 Douglas Harper
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