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aircraft vs. airplane

[ air-kraft, -krahft ]
noun,
  1. any machine supported for flight in the air by buoyancy or by the dynamic action of air on its surfaces, especially powered airplanes, gliders, and helicopters.
[ air-pleyn ]
noun
  1. a heavier-than-air aircraft kept aloft by the upward thrust exerted by the passing air on its fixed wings and driven by propellers, jet propulsion, etc.
  2. any similar heavier-than-air aircraft, as a glider or helicopter.