ratiocination

[rash-ee-os-uh-ney-shuhn, -oh-suh-, rat-ee-]
noun
the process of logical reasoning.

Origin:
1520–30; < Latin ratiōcinātiōn- (stem of ratiōcinātiō), equivalent to ratiōcināt(us) (see ratiocinate) + -iōn- -ion

ratiocinative, adjective
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World English Dictionary
ratiocinate (ˌrætɪˈɒsɪˌneɪt)
 
vb
(intr) to think or argue logically and methodically; reason
 
[C17: from Latin ratiōcinārī to calculate, from ratiōreason]
 
ratioci'nation
 
n
 
rati'ocinative
 
adj
 
rati'ocinator
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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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, © 2010 Douglas Harper
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Example sentences
The reliance of reason vs emotion, individual ratiocination vs historical or social wisdom, may vary.
When you come down to it, there is too little action and too much ratiocination for either movies or the stage.
If bud ratiocination from must firm a substance talk sympathizes.
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