from The American Heritage® Dictionary of the English Language, 4th Edition

  • Four: quadrilateral.
  • Square: quadrate.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • Four.

from the GNU version of the Collaborative International Dictionary of English

  • A combining form meaning four, four times, fourfold.

from The Century Dictionary and Cyclopedia

  • An element in many compounds of Latin origin or formation, meaning ‘four.’ In quadrangle, quadrangular (as in Latin), and in quadrennial, quadrennium, it is reduced to quadr-.


Middle English, from Latin; see kwetwer- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin quattuor ("four"). (Wiktionary)


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