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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. n. A four-sided plane figure with four right angles.

Century Dictionary and Cyclopedia

  1. Rectangular; right-angled.
  2. n. A quadrilateral plane figure having all its angles right angles and its opposite sides consequently equal. When the adjacent sides are equal, it is a square. The area of a rectangle is equal to the product of two adjacent sides; thus, if its sides measure 6 feet and 4 feet, its area is 24 square feet.
  3. n. The product of two lengths. Thus, especially in old books, “the rectangle under two lines” is spoken of, meaning substantially the product of their lengths.
  4. n. A right angle.
  5. n. A right-angled triangle.

Wiktionary

  1. n. geometry A quadrilateral having opposing sides parallel and four right angles.

GNU Webster's 1913

  1. n. (Geom.) A four-sided figure having only right angles; a right-angled parallelogram.
  2. adj. rare Rectangular.

WordNet 3.0

  1. n. a parallelogram with four right angles

Etymologies

  1. From Middle French, from Old French, from Medieval Latin rectanglum ("right angle"), from rectus ("right") + angulus ("an angle"). (Wiktionary)
  2. French, from Medieval Latin rēctangulum, a right triangle, from Late Latin rēctiangulum : Latin rēctus, right; see reg- in Indo-European roots + Latin angulus, angle. (American Heritage® Dictionary of the English Language, Fourth Edition)

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‘rectangle’ has been looked up 1413 times, loved by 1 person, added to 10 lists, and has a Scrabble score of 12.