Rectangularity and Rectangular

noun

• The property of being shaped like a rectangle.
  • synonyms: oblongness

(n.) The quality or condition of being rectangular or right-angled.

adjective

• Having four right angles.
  • usage: "a rectangular figure twice as long as it is wide"
• Having a set of mutually perpendicular axes; meeting at right angles.
  • usage: "wind and sea may displace the ship's center of gravity along three orthogonal axes"; "a rectangular Cartesian coordinate system"
  • synonyms: orthogonal

(a.) Right-angled; having one or more angles of ninety degrees.