Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A polygon with four sides and four angles; a quadrilateral.

from The Century Dictionary.

  • noun In geometry, a figure having four angles; a quadrangle; a quadrilateral.
  • noun 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 the GNU version of the Collaborative International Dictionary of English.

  • noun (Geom.) A plane figure having four sides and angles; a quadrangle, as a square, a rhombus, etc.
  • noun (Astrol.) 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 Wiktionary, Creative Commons Attribution/Share-Alike License.

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

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

  • noun a four-sided polygon

Etymologies

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

[Late Latin tetragōnum, from Greek tetragōnon, square, from neuter of Greek tetragōnos, having four angles : tetra-, tetra- + -gōnos, angled; see –gon.]

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