centrifugal force

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

• noun The apparent force, equal and opposite to the centripetal force, drawing a rotating body away from the center of rotation, caused by the inertia of the body.

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

• noun in everyday understanding, centrifugal force is the effect that tends to move an object away from the center of a circle it is rotating about (a consequence of inertia).
• noun physics : In a rotating reference frame, the apparent force that seems to push all bodies away from the centre of rotation of the frame and is a consequence of the body's mass and the frame's angular speed. It works in conjunction with the Coriolis force to give correct motion.
• noun physics : In circular motion, the 'reactive' centrifugal force is a real force applied by the accelerating body that is equal and opposite to the centripetal force that is acting on the accelerating body.
• noun physics : In polar coordinates, the apparent radial force that acts away from the center and is a consequence of the body's angular speed around the origin.

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

• noun the outward force on a body moving in a curved path around another body