Definitions
1.nounThe quality of being synonymous; sameness of meaning.
2.nounA list or collection of synonyms, often compared and contrasted.
3.nounThe study of synonyms.
4.nounA system of synonyms.
5.nounThe collective synonyms (all the names referring to a particular taxon, except the correct name)
6.nounThe state of not being a correct name, of being a synonym"In 1924 this name was reduced to synonymy."
7.nounThe collective synonyms (all the names referring to the same taxon, including the correct name)