synonym [Grk ónyma ‘name’]

In the strictest sense, a word or expression that has the same meaning as another word or expression. In the case of referential words, synonyms have the same referent. For example, morning star and evening star are synonyms because they both refer to the planet Venus. In the broadest sense, any words that have overlapping meanings are said to be synonyms, e.g. acquire, get, obtain, receive, etc. ( also extension, intension, lexical field theory, synonymy, thesaurus)

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synonymy

In the broader sense, any dictionary that provides explanations of the lexemes through semantic paraphrases (mare ‘female horse’). In the narrower sense, a compilation aiming at the inclusion of all synonymous expressions, based on a very broad concept of synonymy.