# Definition of quadrant

**quadrant**Noun One of the four sections made by dividing an area with two perpendicular lines.**quadrant**Noun The four regions of the Cartesian plane bounded by the x-axis and y-axis.**quadrant**Noun One fourth of a circle or disc; a sector with an angle of 90°.**quadrant**Noun A measuring device with a graduated arc of 90° used in locating an altitude.