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Adjective: self-propelled  'self-pru'peld
  1. Containing within itself the means of propulsion or movement
    "a self-propelled vehicle";
    - automotive, self-propelling
  2. Moved forward by its own force or momentum
    "the arms program is now self-propelled"; "a self-propelled egotist";
    - self-propelling

See also: dynamic, dynamical, moving

Encyclopedia: Self-propelled