Definition:Angular Coordinate/Also known as

Angular Coordinate: Also known as
The angular coordinate in a system of polar coordinates is also known as the polar angle, or azimuth.

Other words that can be seen to mean the same thing are:
 * amplitude
 * anomaly
 * vectorial angle
 * inclination.

Beware the term azimuth, as it is used in astronomy in a similar but significantly different way, to mean the angle measured from the principal vertical circle.