[rash-ee-os-uh-neyt, -oh-suh-, rat-ee-]

verb (used without object), ra·ti·oc·i·nat·ed, ra·ti·oc·i·nat·ing.

to reason; carry on a process of reasoning.

Origin of ratiocinate

1635–45; < Latin ratiōcinātus past participle of ratiōcinārī to reckon, calculate, conclude, verbal derivative of ratiō reason
Related formsra·ti·oc·i·na·tor, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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Historical Examples of ratiocinate

British Dictionary definitions for ratiocinate



(intr) to think or argue logically and methodically; reason
Derived Formsratiocination, nounratiocinative, adjectiveratiocinator, noun

Word Origin for ratiocinate

C17: from Latin ratiōcinārī to calculate, from ratiō reason
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for ratiocinate

"to reason," 1640s, from Latin ratiocinatus, past participle of ratiocinare (see ratiocination). Related: Ratiocinant.

Online Etymology Dictionary, © 2010 Douglas Harper