#acceleration  (physics) a rate of change of velocity
  supertype:  acceleration.rate  an increase in speed; "modern science caused an acceleration of cultural change"
  subtype:  centripetal_acceleration__centripetalacceleration  the acceleration toward the center that holds a satellite in elliptical orbit
  subtype:  acceleration_unit  a unit for measuring acceleration
     subtype:  gal.acceleration_unit  a unit of gravitational acceleration equal to one centimeter per second per second (named after Galileo)

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