WordReference Random House Unabridged Dictionary of American English © 2017
syn•on•y•my  (si nonə mē),USA pronunciation n., pl.  -mies  for 3, 4.
  1. the quality of being synonymous;
    equivalence in meaning.
  2. the study of synonyms.
  3. a set, list, or system of synonyms.
  4. Biologya list of the scientific names, with explanatory matter and location of type or types, for a particular taxonomic group.
  • Greek synōnymía. See synonymous, -y3
  • Late Latin synōnymia
  • 1600–10

Collins Concise English Dictionary © HarperCollins Publishers::

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. a collection of the synonyms of a species or group

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