(1):
(n.) The act of rubbing the surface of one body against that of another; attrition; in hygiene, the act of rubbing the body with the hand, with flannel, or with a brush etc., to excite the skin to healthy action.
(2):
(n.) The resistance which a body meets with from the surface on which it moves. It may be resistance to sliding motion, or to rolling motion.
(3):
(n.) A clashing between two persons or parties in opinions or work; a disagreement tending to prevent or retard progress.