having the character of synonyms or a synonym; equivalent in meaning; expressing or implying the same idea.

1600–10; < Medieval Latin synōnymus < Greek synṓnymos, equivalent to syn- syn- + -ōnym- -onym + -os adj. suffix; see -ous

synonymously, adverb
synonymousness, noun
nonsynonymous, adjective
nonsynonymously, adverb
unsynonymous, adjective
unsynonymously, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
synonymous (sɪˈnɒnɪməs)
adj (foll by with)
1.  (often foll by with) being a synonym (of)
2.  closely associated (with) or suggestive (of): his name was synonymous with greed

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1600, from M.L. synonymus, from Gk. synonymos (see synonym).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The bird became synonymous with extinction, a haunting reminder of what a
  culture may lose when it squanders its natural wealth.
The word simply cannot be used as synonymous with bad writing.
Sometimes the synonymous words are accepted catch-phrases, sometimes they
  evince pure pleasure in language.
Still others regard language and grammar as virtually synonymous.
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