Mechanism

Webster's Dictionary

(1): ( n.) The arrangement or relation of the parts of a machine; the parts of a machine, taken collectively; the arrangement or relation of the parts of anything as adapted to produce an effect; as, the mechanism of a watch; the mechanism of a sewing machine; the mechanism of a seed pod.

(2): ( n.) An ideal machine; a combination of movable bodies constituting a machine, but considered only with regard to relative movements.

(3): ( n.) Mechanical operation or action.