Definition from Wiktionary, the free dictionary
synonymy (plural synonymies)
- (semantics) The quality of being synonymous; sameness of meaning.
- A list or collection of synonyms, often compared and contrasted.
- The study of synonyms.
- A system of synonyms.
- (botany) The collective synonyms (all the names referring to a particular taxon, except the correct name)
- (botany) The state of not being a correct name, of being a synonym
- In 1924 this name was reduced to synonymy.
- (zoology) The collective synonyms (all the names referring to the same taxon, including the correct name)
See also 
quality of being synonymous
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