• synonyms


[rash-ee-os-uh-neyt, -oh-suh-, rat-ee-]
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verb (used without object), ra·ti·oc·i·nat·ed, ra·ti·oc·i·nat·ing.
  1. to reason; carry on a process of reasoning.
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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. 2018

Related Words


Examples from the Web for ratiocinate

Historical Examples

  • But I give you warning—Stasie may weep and Henri ratiocinate—it will not serve you twice.

    The Works of Robert Louis Stevenson

    Robert Louis Stevenson

British Dictionary definitions for ratiocinate


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

Word Origin

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.

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Online Etymology Dictionary, © 2010 Douglas Harper