1. • noun - the atomic process that occurs during a chemical reaction
   • noun - the technical aspects of doing something
   • noun - a natural object resembling a machine in structure or function
   • noun - (philosophy) the philosophical theory that all phenomena can be explained in terms of physical or biological causes
   • noun - device consisting of a piece of machinery
2. • A machine or mechanical appliance.
   • The arrangement of connected parts in a machine.
   • A system of parts that operate or interact like those of a machine: the mechanism of the solar system.
   • An instrument or a process, physical or mental, by which something is done or comes into being: “The mechanism of oral learning is largely that of continuous repetition” (T.
   • A habitual manner of acting to achieve an end.
   • The involuntary and consistent response of an organism to a given stimulus.
   • A usually unconscious mental and emotional pattern that dominates behavior in a given situation or environment: a defense mechanism.
   • The sequence of steps in a chemical reaction.
   • The doctrine that all natural phenomena are explicable by material causes and mechanical principles.

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