ratiocinative

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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