Definition of "angular velocity" []

• The rate of change of angular displacement with respect to time. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The angular velocity is not quite constant about E, the equant or empty focus, but the difference could hardly have been detected in Kepler's time."