D defs.my
Entry 4 senses Webster, 1913

Mechanism

/mĕk'-ən-ĭzˌ-əm/ · Mech·an·ism · IPA /ˈmik.ə.nɪ.zəm/
01 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…
  1. 1.
    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. 2.
    The series of causal relations that operate to produce an effect in any system; as, the mechanism of a chemical reaction.
  3. 3.
    Mechanical operation or action.
    “He acknowledges nothing besides matter and motion; so that all must be performed either by mechanism or accident.” Bentley.
  4. 4.
    An ideal machine; a combination of movable bodies constituting a machine, but considered only with regard to relative movements.(Kinematics)