Definition of rectangular
1
: shaped like a rectangle
a rectangular area
2a
: crossing, lying, or meeting at a right angle
rectangular axes
b
: having edges, surfaces, or faces that meet at right angles : having faces or surfaces shaped like rectangles
rectangular parallelepipeds a rectangular solid
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Merriam-Webster unabridged
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Time Traveler for rectangular
The first known use of rectangular was circa 1560
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