Definition of rectangular
English to English adjective - Right-angled; having one or more angles of ninety degrees.
source: Webster 1913 adjective satellite - having four right angles
A rectangular figure twice as long as it is wide.
source: WordNet 3.0 - 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.
source: WordNet 3.0
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