Definitions from Wiktionary ( )

▸ noun:  (semantics) The quality of being synonymous; sameness of meaning.
▸ noun:  A list or collection of synonyms, often compared and contrasted.
▸ noun:  (rhetoric) The use of synonyms to clarify or explain one's meaning.
▸ noun:  The study of synonyms.
▸ noun:  A system of synonyms.
▸ noun:  (taxonomy) The state of not being the name to be used, of being a synonym.
▸ noun:  (taxonomy, by extension) A group or list of synonyms.

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