What is the meaning of Synonym?

A term (word or phrase) which is synonymous with others.

Any of the various names that could in theory be used for a taxon in accordance with the relevant rules.

The subset of those names other than the one to be used according to the rules.

Any name that has been applied to a taxon other than the one to be used, including those not allowed by the rules such as misspellings or nomina nuda.

An alternative (often shorter) name defined for an object in a database.

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Source: wiktionary.org