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ratiocination

[rash-ee-os-uh-ney-shuh n, -oh-suh-, rat-ee-] /ˌræʃ iˌɒs əˈneɪ ʃən, -ˌoʊ sə-, ˌræt i-/
noun
1.
the process of logical reasoning.
Origin
1520-1530
1520-30; < Latin ratiōcinātiōn- (stem of ratiōcinātiō), equivalent to ratiōcināt(us) (see ratiocinate) + -iōn- -ion
Related forms
ratiocinative, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin and History for ratiocinative

ratiocination

n.

"process of reasoning," 1520s, from Latin ratiocinationem (nominative ratiocinatio) "a reasoning, calm reasoning," from past participle stem of ratiocinare "to calculate, deliberate," from ratio (see ratio) + -cinari, which probably is related to conari "to try" (see conation).

Most writers make ratiocination synonymous with reasoning. J.S. Mill and others hold that the word is usually limited to necessary reasoning. [Century Dictionary]

Online Etymology Dictionary, © 2010 Douglas Harper
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