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The Collaborative International Dictionary
Ratiocination

Ratiocination \Ra`ti*oc`i*na"tion\ (r[a^]sh`[i^]*[o^]s"[i^]*n[=a]"sh[u^]n), n. [L. ratiocinatio: cf. F. ratiocination.] The process of reasoning, or deducing conclusions from premises; deductive reasoning.

Douglas Harper's Etymology Dictionary
ratiocination

"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).\n\nMost writers make ratiocination synonymous with reasoning. J.S. Mill and others hold that the word is usually limited to necessary reasoning.

[Century Dictionary]

Wiktionary
ratiocination

n. 1 reasoning, conscious deliberate inference; the activity or process of reasoning. 2 thought or reasoning that is exact, valid and rational. 3 A proposition arrived at by such thought.

WordNet
ratiocination
  1. n. the proposition arrived at by logical reasoning (such as the proposition that must follow from the major and minor premises of a syllogism) [syn: conclusion]

  2. logical and methodical reasoning

Usage examples of "ratiocination".

Mudd, it sounds like Mudd, but by the Ratiocination of Inn, it thinks like a Vulcan!

The cautious old gentleman knit his brows tenfold closer after this explanation, being sorely puzzled by the ratiocination of the syllogism, while methought the one in pepper-and-salt eyed him with something of a triumphant leer.

And the terrible part of it is they succeed so wonderfully that philosophers like myself are apt to find our ratiocinations wofully mixed when we try to reason about the matter.

Yet, ever and again, you will find him back at that little table, the manuscript in his hand, and the expansion of his ratiocinations about Utopia conscientiously resumed.

To say that he was thinking of Miss Chapman would imply too much power of ratiocination and abstract scrutiny on his part.

For there is not one of them that begins his ratiocination from the Definitions, or Explications of the names they are to use.

Has any fellow, of the dime a dozen type, it might with some profit some dull evening quietly be hinted--has any usual sort of ornery josser, flatchested fortyish, faintly flatulent and given to ratiocination by syncopation in the elucidation of complications,of his greatest Fung Yang dynasdescendanced,only another the son of, in fact, ever looked sufficiently longly at a quite everydaylooking stamped addressed envelope?