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From The Collaborative International Dictionary of English v.0.48:
Gravitation \Grav"i*ta"tion\, n. [Cf. F. gravitation. See Gravity.] 1. The act of gravitating. [1913 Webster] 2. (Pysics) That species of attraction or force by which all bodies or particles of matter in the universe tend toward each other; called also attraction of gravitation, universal gravitation, and universal gravity. See Attraction, and Weight. [1913 Webster] Law of gravitation, that law in accordance with which gravitation acts, namely, that every two bodies or portions of matter in the universe attract each other with a force proportional directly to the quantity of matter they contain, and inversely to the squares of their distances. [1913 Webster]