1 
[ adjective ] having four right angles
Examples "a rectangular figure twice as long as it is wide" Used in print (Jack Kaplan, "The Health Machine Menace: Therapy by...)As he applied the applicator extending from the machine  which consisted_of seven differently colored neon_tubes superimposed on a rectangular base  to the supposedly diseased portions of Mrs._Shaefer 's body , Lee kept_up a steady stream of pseudo scientific mumbojumbo . Related terms 
2 
[ adjective ] having a set of mutually perpendicular axes; meeting at right angles
Synonyms Examples "wind and sea may displace the ship's center of gravity along three orthogonal axes" "a rectangular Cartesian coordinate system" Used in print (R. P. Jerrard, "Inscribed squares in plane curves"...)In the Cplane we construct a set of rectangular Cartesian coordinates u , v with the origin at Q and such_that both C and **f have finite slope at Q . Related terms 
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