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Identity vs Unique - What's the difference?

identity | unique |

As nouns the difference between identity and unique

is that identity is sameness, identicalness; the quality or fact of (several specified things) being the same while unique is a thing without a like; something unequalled or unparallelled.

As an adjective unique is

(not comparable) being the only one of its kind; unequaled, unparalleled or unmatched.

identity

Noun

(identities)
  • Sameness, identicalness; the quality or fact of (several specified things) being the same.
  • * 1997 , Hydrothermal Vent Fauna'', in ''Advances in Marine Biology: The Biogeography of the Oceans , page 111:
  • The difference or character that marks off an individual from the rest of the same kind, selfhood.
  • *
  • A name or persona—the mask or appearance one presents to the world—by which one is known.
  • This criminal has taken on several identities .
  • Sense of who one is.
  • I've been through so many changes, I have no sense of identity .
    This nation has a strong identity .
  • (algebra, computing) Any function which maps all elements of its domain to themselves.
  • (algebra) An element of an algebraic structure which, when applied to another element under an operation in that structure, yields this, second element.
  • Synonyms

    * selfhood * identity function

    Derived terms

    * additive identity * identity card * identity of indiscernibles * identity theft * law of identity * left identity * mistaken identity * multiplicative identity * personal identity * quasiidentity * right identity

    unique

    English

    Adjective

    (en adjective)
  • (not comparable) Being the only one of its kind; unequaled, unparalleled or unmatched.
  • *
  • *
  • * {{quote-book, year=1963, author=(Margery Allingham)
  • , title=(The China Governess) , chapter=3 citation , passage=‘[…] There's every Staffordshire crime-piece ever made in this cabinet, and that's unique . The Van Hoyer Museum in New York hasn't that very rare second version of Maria Marten's Red Barn over there, nor the little Frederick George Manning—he was the criminal Dickens saw hanged on the roof of the gaol in Horsemonger Lane, by the way—’}}
  • *
  • *
  • Of a feature, such that only one holder has it.
  • Particular, characteristic.
  • * '>citation
  • (proscribed) Of a rare quality, unusual.
  • * {{quote-book, passage=And as I look back, it seems to me that we were fairly unique , the sixty of us, in that there wasn’t one good mixer in the bunch.
  • , title=For Esmé—With Love and Squalor , author=J.D. Salinger , year=1950}}

    Usage notes

    The comparative and superlative forms more unique'' and ''most unique'', as well as the use of ''unique'' with modifiers as in ''fairly unique'' and ''very unique , are sometimes proscribed, with the reasoning that either something is unique or it is not.

    Synonyms

    (checksyns) * one of a kind * sui generis * singular

    Derived terms

    * uniqueness

    Noun

    (en noun)
  • A thing without a like; something unequalled or unparallelled.
  • * De Quincey
  • The phoenix, the unique of birds.