quadrilateral

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Suppose that, by way of experiment, I assume that the fourth angle of my quadrilateral will be acute, or again obtuse, will the body of conclusions I can now deduce from my set of postulates be free from contradictions or not?

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Definitions (13)

Toggle American Heritage definitions American Heritage Dictionary (2)

  1. noun Mathematics A polygon having four sides.
  2. adjective Having four sides.

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Etymologies (1)

Toggle Century etymologies Century Dictionary (1)

  1. from Latin quadrilaterus, four-sided, from quattuor (quadri-), = English four, + latus (later-), side, flank: see lateral.
 

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/kwɑdrɪˈlætərəl/
by American Heritage

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