definition
US /ˌdef.ɪˈnɪʃ.ən/
UK /ˌdef.ɪˈnɪʃ.ən/

1.
a statement of the exact meaning of a word, phrase, or term
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Look up the definition of 'ephemeral' in the dictionary.
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The legal definition of assault varies by jurisdiction.
2.
the degree of distinctness in outline of an object, image, or sound
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The high-resolution screen provides excellent image definition.
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The sculptor achieved remarkable muscle definition in the statue.