Definition of pulley
1 : a sheave or small wheel with a grooved rim and with or without the block in which it runs used singly with a rope or chain to change the direction and point of application of a pulling force and in various combinations to increase the applied force especially for lifting weights
2 : a pulley or pulleys with ropes to form a tackle that constitutes one of the simple machines
3 : a wheel used to transmit power by means of a band, belt, cord, rope, or chain passing over its rim
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