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(1)   The technical aspects of doing something
"A mechanism of social control"
"Mechanisms of communication"
"The mechanics of prose style"
(2)   Device consisting of a piece of machinery; has moving parts that perform some function
(3)   (philosophy) the philosophical theory that all phenomena can be explained in terms of physical or biological causes
(4)   A natural object resembling a machine in structure or function
"The mechanism of the ear"
"The mechanism of infection"
(5)   The atomic process that occurs during a chemical reaction
"He determined unique mechanisms for the photochemical reactions"


  1. Within a machine or machinery; any mechanical means for the conversion or control of motion, or the transmission or control of power
  2. Any combination of cams, gears, links, belts, chains and logical mechanical elements
  3. A group of objects or parts that interact together. (as in Political machine)
  4. A mental, physical or chemical process.
  5. A theory that all natural phenomena can be explained by physical causes.