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A synonym is a word or phrase that means exactly or

A synonym is a word or phrase that means exactly or nearly the

same as another lexeme (word or phrase) in the same language. Words that are synonyms are said to be synonymous, and the state of being a synonym is called synonymy. 
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For example, the words begin, start, commence, and initiate are all

 For example, the words begin, start, commence, and initiate are all synonyms of one another. Words

are typically synonymous in one particular sense: for example, long and extended in the context long time or extended time are synonymous, but long cannot be used in the phrase extended family.
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Synonyms with the exact same meaning share a seme or denotational

Synonyms with the exact same meaning share a seme or denotational sememe, whereas those

with inexactly similar meanings share a broader denotational or connotational sememe and thus overlap within a semantic field. The former are sometimes called cognitive synonyms and the latter, near-synonyms, plesionyms or poecilonyms.
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Some lexicographers claim that no synonyms have exactly the same meaning

Some lexicographers claim that no synonyms have exactly the same meaning (in all

contexts or social levels of language) because etymology, orthography, phonic qualities, ambiguous meanings, usage, and so on make them unique. Different words that are similar in meaning usually differ for a reason: feline is more formal than cat; long and extendedare only synonyms in one usage and not in others (for example, a long arm is not the same as an extended arm). 
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Metonymy can sometimes be a form of synonymy: the White House

Metonymy can sometimes be a form of synonymy: the White House is used as a

synonym of the administration in referring to the U.S. executive branch under a specific president. Thus a metonym is a type of synonym, and the word metonym is a hyponym of the word synonym.
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The analysis of synonymy, polysemy, hyponymy, and hypernymy is inherent to

The analysis of synonymy, polysemy, hyponymy, and hypernymy is inherent to taxonomy and ontology in the information-science senses of those

terms. It has applications in pedagogy and machine learning, because they rely on word-sense disambiguation.