noun, plural synonymies for 3, 4.
the quality of being synonymous; equivalence in meaning.
the study of synonyms.
a set, list, or system of synonyms.
Biology. a list of the scientific names, with explanatory matter and location of type or types, for a particular taxonomic group.

1600–10; < Late Latin synōnymia < Greek synōnymía. See synonymous, -y3 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
synonymy (sɪˈnɒnɪmɪ)
n , pl -mies
1.  the study of synonyms
2.  the character of being synonymous; equivalence
3.  a list or collection of synonyms, esp one in which their meanings are discriminated
4.  biology a collection of the synonyms of a species or group

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Example sentences
Synonymy, redundancy, and the name of the crocodile stem-group.
The synonymy of this taxon is complex, and correct use of some scientific names is currently uncertain.
The objection to synonymy hinges upon the problem of collateral information.
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