Medical Definition of gravitation
: a force manifested by acceleration toward each other of two free material particles or bodies or of radiant-energy quanta as if they were particles (as in the bending of rays of starlight passing close to the sun) : an attraction between two bodies that is proportional to the product of their masses, inversely proportional to the square of the distance between them, and independent of their chemical nature or physical state and of intervening matter
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