mechanism
nounA machine or mechanical appliance.
nounThe arrangement of connected parts in a machine.
nounA system of parts that operate or interact like those of a machine.
nounAn instrument or a process, physical or mental, by which something is done or comes into being.
nounA habitual manner of acting to achieve an end.
nounA usually unconscious mental and emotional pattern that shapes behavior in a given situation or environment.
nounThe sequence of steps in a chemical reaction.
nounThe doctrine that all natural phenomena are explicable by material causes and mechanical principles.
nounThe structure of a machine, engine, or other contrivance for controlling or utilizing natural forces; the arrangement and relation of parts, or the parts collectively, in any machine, tool, or other contrivance; means of mechanical action; machinery; hence, the structure of anything that is conceived to resemble a machine.