The quality of being synonymous; sameness of meaning.

A figure by which synonymous words are used to amplify a discourse.

the semantic relation that holds between two words that can (in a given context) express the same meaning

A semantic relationship in which the meanings of two words are similar or identical.

A section of a systematic presentation about an organism that lists all of the names that have been used for the organism including synonyms, new combinations, misidentifications, etc. In some cases this section may include only true synonyms

The synonym relation between words. Synonymy is not necessarily transitive in that a word can be a synonym of several other words that have very different meanings. For example, the word hot is a synonym of spicy, eager and warm. A human reader generally uses context to supply clues for disambiguating which meaning of a word is in force. See also polysemy

"Two terms that mean the same thing. As pointed out by John Saeed*, there are few true synonyms."

Two words that have (more or less) the same meaning. (Thorsten Tripple)