n. A plane figure having four angles; a foursquare figure; a quadrilateral; in mod. geom., a plane figure formed by six lines intersecting at four points.n. A square or oblong court nearly or quite surrounded by buildings: an arrangement common with public buildings, as palaces, city halls, colleges, etc.n. In palmistry, the space between the line of the heart and that of the head.n. A square block of buildings.n. Any square block, as of stone.n. A region measuring 15′ lat. by 15′ long. (or 30′ lat. by 30′ long., or 1° lat, by 1° long., according to the density of tho population) as shown on an atlas sheet of the United States Geological Survey.