#gradient  a graded change in the magnitude of some physical quantity or dimension
  supertype:  change.relation  a relational difference between states; especially between states before and after some event: "he attributed the change to their marriage"
  subtype:  gravity_gradient__gravitygradient  a gradient in the gravitational forces acting on different parts of a nonspherical object; "the gravity gradient of the moon causes the ocean tides on Earth"
  subtype:  temperature_gradient__temperaturegradient  change in temperature as a function of distance (especially altitude)

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