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[si-non-uh-muh s] /sɪˈnɒn ə məs/
having the character of synonyms or a synonym; equivalent in meaning; expressing or implying the same idea.
Origin of synonymous
1600-10; < Medieval Latin synōnymus < Greek synṓnymos, equivalent to syn- syn- + -ōnym- -onym + -os adj. suffix; see -ous
Related forms
synonymously, adverb
synonymousness, noun
nonsynonymous, adjective
nonsynonymously, adverb
unsynonymous, adjective
unsynonymously, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for synonymous
Contemporary Examples
Historical Examples
  • For most men dogwood is synonymous of spring in Virginia, but to him redbud bloomed first, and the more persuasively of spring.

    The Pocahontas-John Smith Story Pocahontas Wight Edmunds
  • Do you mean to assert (he asked) that lawful and just are synonymous terms?

    The Memorabilia Xenophon
  • General terms were synonymous with real existences, and these were the only objects of philosophy.

  • Parasynanche is a synonymous term, but refers to a milder synanche.

  • It is of great importance in practice, but in truth, for our present purpose, synonymous with what we have already written.

    Fungi: Their Nature and Uses Mordecai Cubitt Cooke
British Dictionary definitions for synonymous


(often foll by with) being a synonym (of)
(postpositive) foll by with. closely associated (with) or suggestive (of): his name was synonymous with greed
Derived Forms
synonymously, adverb
synonymousness, noun
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
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Word Origin and History for synonymous

c.1600, from Medieval Latin synonymus, from Greek synonymos (see synonym). Related: Synonymously.

Online Etymology Dictionary, © 2010 Douglas Harper
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