angular momentum

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The vector product of the position vector (from a reference point) and the linear momentum of a particle.
• noun The vector sum of the angular momentums of each infinitesimal component particle of an extended body.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun physics The vector product that describes the rotary inertia of a system about an axis and is conserved in a closed system. For an isolated rigid body, it is a measure of the extent to which an object will continue to rotate in the absence of an applied torque.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the product of the momentum of a rotating body and its distance from the axis of rotation