moment of inertia

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

• noun A measure of a body's resistance to angular acceleration, equal to.
• noun The product of the mass of a particle and the square of its distance from an axis of rotation.
• noun The sum of the products of each mass element of a body multiplied by the square of its distance from an axis.
• noun The sum of the products of each element of an area multiplied by the square of its distance from a coplanar axis.

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

• noun physics A measure of a body's resistance to a change in its angular rotation velocity
• noun engineering A measure of a body's resistance to bending; second moment of inertia; second moment of area.

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

• noun the tendency of a body to resist angular acceleration