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From: Webster's Revised Unabridged Dictionary (1913)

 Tan·gen·tial a. Geom. Of or pertaining to a tangent; in the direction of a tangent.
 Tangential force Mech., a force which acts on a moving body in the direction of a tangent to the path of the body, its effect being to increase or diminish the velocity; -- distinguished from a normal force, which acts at right angles to the tangent and changes the direction of the motion without changing the velocity.
 Tangential stress. Engin. See Shear, n., 3.
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