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rectangular

 
Adjective rectangular has 2 senses
  1. rectangular - having four right angles; "a rectangular figure twice as long as it is wide"
    Antonym:
    rounded (indirect, via angular)
  2. orthogonal, rectangular - having a set of mutually perpendicular axes; meeting at right angles; "wind and sea may displace the ship's center of gravity along three orthogonal axes"; "a rectangular Cartesian coordinate system"
    Antonym: oblique (indirect, via parallel, perpendicular)
    Antonym: parallel (indirect, via perpendicular, oblique)
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