See quadrate.n. In printing, a blank type for the larger blank spaces in or at the end of printed lines, cast lower in height, so that it shall not be inked or impressed: made in four forms for all text type—en, em, two-em, three-em. Usually abbreviated to quad.n. The low quadrat, for letterpress work, is about three fourths of an inch high: the high quadrat, for stereotype work, is about ten twelfths of an inch high.n. An instrument furnished with sights, a plummet, and an index, and used for measuring altitudes, but superseded by more perfect instruments in modern use. Also called geometrical square, and line of shadows.n. A series or set of four.n. In experimental agriculture, a square area of convenient size laid off for the purpose of accurate planting.n. In phytogeography, a similar square laid off for close study of the relative abundance of species or of other questions.