1 The horizontal angle, measured in degrees, between a baseline drawn from a center point and another line drawn from the same point. Normally, the baseline points true north and the angle is measured clockwise from the baseline.
2 [analysisgeoprocessing] A compass direction. For example, in some GIS software, the direction from which a light source illuminates a surface is called the azimuth.
3 [navigation] In navigation, the horizontal angle, measured in degrees, between a reference line drawn from a point and another line drawn from the same point to a point on the celestial sphere. Normally, the reference line points true north and the angle is measured clockwise from the reference line.