<p><strong>Noun</strong></p><ul><li>a wheel, with a grooved rim for carrying a line, that turns in a frame or block and serves to change the direction of or to transmit force, as when one end of the line is pulled to raise a weight at the other end: one of the simple machines.</li><li>a combination of such wheels in a block, or of such wheels or blocks in a tackle, to increase the force applied.</li><li>a wheel driven by or driving a belt or the like, used to deliver force to a machine, another belt, etc., at a certain speed and torque.</li></ul><p><strong>End of Response</strong></p>