Definition of: quadrangle

(kwod′rang·gəl) noun
1. Geom. A plane figure having four sides and four angles.
2. A court, square or oblong, as within a public building.
3. A tract of land as represented by the United States Geological Survey on one of its atlas sheets. [<L quadrangulum <quattuor four + angulus angle]
—quad·ran′·gu·lar adjective