Definitions

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

  • n. A four-sided polygon; a quadrilateral.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A quadrilateral.
  • n. An aspect of two planets with regard to the Earth when they are distant from each other ninety degrees, or a quarter-circle.

from the GNU version of the Collaborative International Dictionary of English

  • n. A plane figure having four sides and angles; a quadrangle, as a square, a rhombus, etc.
  • n. An aspect of two planets with regard to the earth when they are distant from each other ninety degrees, or the fourth of a circle.

from The Century Dictionary and Cyclopedia

  • n. In geometry, a figure having four angles; a quadrangle; a quadrilateral.
  • n. In astrology, an aspect of two planets with regard to the earth when they are distant from each other 90°, or the fourth part of a circle; quartile aspect; square.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a four-sided polygon

Etymologies

Late Latin tetragōnum, from Greek tetragōnon : tetra-, tetra- + -gōnon, -gon.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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