Moment

1. A minute portion of time; a point of time; an instant; as, at that very moment.
2. Impulsive power; force; momentum.
3. Importance, as in influence or effect; consequence; weight or value; consideration.
4. An essential element; a deciding point, fact, or consideration; an essential or influential circumstance.
5. (Math.) An infinitesimal change in a varying quantity; an increment or decrement.
6. (Mech.) Tendency, or measure of tendency, to produce motion, esp. motion about a fixed point or axis.
Moment of a couple (Mech.),
the product of either of its forces into the perpendicular distance between them.
Moment of a force . (Mech.) (a) With respect to a point,
the product of the intensity of the force into the perpendicular distance from the point to the line of direction of the force
Moment of inertia ,
of a rotating body, the sum of the mass of each particle of matter of the body into the square of its distance from the axis of rotation; -- called also moment of rotation and moment of the mass.
Statical moment ,
the product of a force into its leverage; the same as moment of a force with respect to a point, line, etc.
Virtual moment .
See under Virtual.