What is the meaning of Synonymy?

A certain degree of similarity between the meaning(s) of several (synonymous) words or phrases. (See Usage notes below)

A list or collection of synonyms, often compared and contrasted.

The use of synonyms to clarify or explain one's meaning.

The study of synonyms.

A system of synonyms. (The addition of quotations indicative of this usage is being sought:)

The state of not being the name to be used, of being a synonym.

A group or list of synonyms.

Source: wiktionary.org

See also