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Quad as a word or prefix usually means 'four'. It may refer to:


  • Quadrilateral Security Dialogue, a strategic security dialogue between Australia, India, Japan, and the United States
  • Quadrilateral group, an informal group which includes the trade spokesmen of the United States, Japan, Canada, and the European Union
  • Quad Cities, a group of five cities straddling the boundary between the U.S. states of Iowa and Illinois
  • The "Quad", the senior members of the Cameron–Clegg coalition government in the United Kingdom from 2010 to 2015

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