Answer: mechanism

AnswerCrossword Clue
MECHANISMEngine parts.
MECHANISMApparatus
mechanismA system of parts working together in a machine; a piece of machinery
mechanismThe doctrine that all natural phenomena, including life and thought, allow mechanical explanation by physics and chemistry
mechanismA contrivance in the plot of a literary work
mechanismA natural or established process by which something takes place or is brought about
mechanismthe belief that life is explainable by mechanical forces