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Using English Wiktionary XML Dump dated Feb 4th 2009
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identity element
  • (noun)
    1. A member of a structure which, when applied to any other element via a binary operation induces an identity mapping; more specifically, given an operation *, an element I is
      a left identity if I * x = x for any x in the structure
      a right identity, x * I = x for any x in the structure
      simply an identity element if both are true