Leverage

n.
  1. The action of a lever; mechanical advantage gained by the lever.
    2. Leverage of a couple (Mech.),
    the perpendicular distance between the lines of action of two forces which act in parallel and opposite directions.
    Leverage of a force ,
    the perpendicular distance from the line in which a force acts upon a body to a point about which the body may be supposed to turn.