a plane figure having four angles and four sides, as a square.
2.
a square or quadrangular space or court that is surrounded by a building or buildings, as on a college campus.
3.
the building or buildings around such a space or court.
4.
the area shown on one of the standard topographic map sheets published by the U.S. Geological Survey: approximately 17 miles (27 km) north to south and from 11 to 15 miles (17 to 24 km) east to west.
Origin: 1400–50;late Middle English < Late Latinquadrangulum, noun use of neuter of Latinquadrangulus, quadriangulus four-cornered. See quadr-, angle
c.1430, from O.Fr. quadrangle (13c.), from L.L. quadrangulum "four-sided figure," prop. neut. of L. adj. quadrangulus "having four quarters," from L. quattuor "four" (see four) + angulus "angle." The shortened form quad for "quadrangle of a college," is first recorded 1820 in Oxford slang.