- The definition of a rectangle is a four-sided figure or shape with four right angles that isn't a square.
An example of a rectangle is the shape of a an 8x10 picture frame.
This picture frame is a rectangle.
- any four-sided plane figure with four right angles
- any such figure or shape that is not a square; oblong
Origin of rectangleFrench ; from Medieval Latin rectangulum ; from Classical Latin rectus (see recti-) + angulus, angle
A four-sided plane figure with four right angles.
Origin of rectangleFrench, from Medieval Latin rēctangulum, a right triangle, from Late Latin rēctiangulum : Latin rēctus, right; see reg- in Indo-European roots + Latin angulus, angle.