What is the meaning of mechanics?

noun

• A craftsman skilled in operating machine tools.
  • synonyms: machinist, mechanic, shop mechanic
• Someone whose occupation is repairing and maintaining automobiles.
  • synonyms: automobile mechanic, auto-mechanic, car-mechanic, mechanic, grease monkey
• The branch of physics concerned with the motion of bodies in a frame of reference.
• The technical aspects of doing something.
  • usage: "a mechanism of social control"; "mechanisms of communication"; "the mechanics of prose style"
  • synonyms: mechanism