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

  • n. A four-sided plane figure with opposite sides parallel.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A convex quadrilateral in which each pair of opposite edges are parallel and of equal length.

from the GNU version of the Collaborative International Dictionary of English

  • n. A right-lined quadrilateral figure, whose opposite sides are parallel, and consequently equal; -- sometimes restricted in popular usage to a rectangle, or quadrilateral figure which is longer than it is broad, and with right angles.

from The Century Dictionary and Cyclopedia

  • n. In geometry, a quadrilateral whose opposite sides are parallel.
  • n. A pantograph.

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

  • n. a quadrilateral whose opposite sides are both parallel and equal in length


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

Late Latin parallēlogrammum, from Greek parallēlogrammon, from neuter sing. of parallēlogrammos, bounded by parallel lines : parallēlos, parallel; see parallel + grammē, line; see gerbh- in Indo-European roots.


  • *This is reputed to be the first rock song to contain the word parallelogram in it.

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  • A square only requires a peg at each corner, with a chalked string drawn from peg to peg; and an oblong, or parallelogram, is made by joining two common squares, and taking off the corners if required.

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  • This addition rule is known as the parallelogram law.

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  • This game is played by marking out in the dust or sand a parallelogram, which is subdivided into a varying number of compartments.

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  • When opposite sides of the figure are parallel to each other it is termed a parallelogram, no matter what the angle of the adjoining lines in the figure may be.

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  • She was particularly perplexed by geometry; she aroused our hilarity by always calling a parallelogram a parallel-O-gram, with a strong emphasis on the penultimate syllable; and she spent several days repeating over to herself, with a mystified countenance, the famous words, "The square of the hypothenuse is equal to the sum of the squares of the two legs."

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  • This evening Mr. Spong come, and sat late with me, and first told me of the instrument called parallelogram,

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  • When the diagonals of the original quadrilateral are congruent, then the parallelogram is a rhombus.

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  • Either through guess and check or by an analysis of the situation, stu - dents should discover the following: When the diagonals of the original quadrilateral are perpendicular, the parallelogram is a rectangle.

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  • Geometric Wonders 135 When the diagonals of the original quadrilateral are congruent and per - pendicular, then the parallelogram is a square.

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