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English

Etymology

From group +‎ -oid.

Pronunciation

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Noun

groupoid (plural groupoids)

  1. (algebra) A magma: a set with a total binary operation.
  2. (algebra and category theory) A set with a partial binary operation that is associative and has identities and inverses.
    • 2013, Julia Goedecke, Category Theory‎:
      A category in which every morphism is an isomorphism is called a groupoid.
          This means that a group is a groupoid with only one object.

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