# moment of inertia

moment of inertianoun

*pl.*

**moments of inertia**

A measure of a body's resistance to angular acceleration, equal to:

**a.**The product of the mass of a particle and the square of its distance from an axis of rotation.

**b.**The sum of the products of each mass element of a body multiplied by the square of its distance from an axis.

**c.**The sum of the products of each element of an area multiplied by the square of its distance from a coplanar axis.

## moment-of-inertia

Noun

(*plural* moments of inertia)

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