parallelogram

Definitions

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

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

from The Century Dictionary.

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

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Geom.) 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.
  • noun (Mech.) a parallelogram the diagonal of which represents the resultant of two velocities, forces, accelerations, momenta, etc., both in quantity and direction, when the velocities, forces, accelerations, momenta, etc., are represented in quantity and direction by the two adjacent sides of the parallelogram.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

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

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

Etymologies

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.]

Examples

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