ra·ti·oc·i·na·tion

[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

ra·ti·oc·i·na·tive, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To Ratiocination
Collins
World English Dictionary
ratiocinate (ˌrætɪˈɒsɪˌneɪt) [Click for IPA pronunciation guide]
 
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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00:10
Ratiocination has a plethora of syllables.
So is supercalifragilisticexpialidocious. Does it mean:
opposition to the withdrawal of state support or recognition from an established church, esp. the Anglican Church in 19th-century England.
(used as a nonsense word by children to express approval or to represent the longest word in English.)
Etymonline
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.
If bud ratiocination from must firm a substance talk sympathizes.
When you come down to it, there is too little action and too much ratiocination for either movies or the stage.
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