Etymology
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quadrangle (n.)

late 14c., "a plane figure having four angles; a rectangle, square, etc.," from Old French quadrangle (13c.) and directly from Late Latin quadrangulum "four-sided figure," noun use of neuter of Latin adjective quadrangulus "having four corners," from Latin quattuor "four" (from PIE root *kwetwer- "four") + angulus "angle" (see angle (n.)). Meaning "four-sided court nearly surrounded by buildings" is from 1590s.

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Definitions of quadrangle

quadrangle (n.)
a four-sided polygon;
Synonyms: quadrilateral / tetragon
quadrangle (n.)
a rectangular area surrounded on all sides by buildings;
Synonyms: quad
From wordnet.princeton.edu