synonymy
noun
syn·on·y·my sə-ˈnä-nə-mē 
plural synonymies
1
a
: a list or collection of synonyms often defined and discriminated from each other
b
: the study or discrimination of synonyms
2
: the scientific names that have been used to designate the same taxonomic group (such as a species)
also : a list of these
3
: the quality or state of being synonymous
Word History
First Known Use
1683, in the meaning defined at sense 1a
Medical Definition
synonymy
noun
syn·on·y·my -mē
plural synonymies
: the scientific names that have been used in different publications to designate a taxonomic group (as a species)
also : a list of these