Synonymy definitions

sĭ-nŏn'ə-mē
Synonymy is the study of words with the same or similar meaning, or the quality of being similar.

An example of synonymy is two people who have similar personalities.

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The quality of being synonymous; equivalence of meaning.
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Study and classification of synonyms.
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A list, book, or system of synonyms.
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A chronological list of the published scientific names that have been applied to a species.
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The study of synonyms.
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A list or listing of synonyms, esp. one in which the terms are discriminated from one another.
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The quality of being synonymous; identity or near identity of meaning.
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The scientific names used in different nomenclature systems to designate the same species, genus, etc.
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A list of such names.
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A chronological list of the published scientific names that have been applied to a species.
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(semantics) The quality of being synonymous; sameness of meaning.
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A list or collection of synonyms, often compared and contrasted.
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The study of synonyms.
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A system of synonyms.
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(botany) The collective synonyms (all the names referring to a particular taxon, except the correct name)
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(botany) The state of not being a correct name, of being a synonym.

In 1924 this name was reduced to synonymy.

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(zoology) The collective synonyms (all the names referring to the same taxon, including the correct name)
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Origin of synonymy

From Latin synonymia, from Ancient Greek συνωνυμία (sunōnumia), from σύν (sun, “with") + ὄνομα (onoma, “name").