Angular velocity or frequency The change of angle per unit time; specifically, in celestial mechanics, the change in angle of the radius vector per unit time. Angular frequency is a scalar measure of rotation rate. It is the magnitude of the vector quantity angular velocity. Space and Time QUDT http://qudt.org/vocab/quantity#AngularVelocity Angular frequency uses the same units as that of angular velocity. ODM2 Units Type Controlled Vocabulary ODM2 Working Group A vocabulary for describing the type of the Unit or the more general quantity that the Unit represents.