grav·i·ta·tion /ˌgrævəˈteʃən/
 引力,地球引力,重力
 grav·i·ta·tion /ˌgrævəˈteʃən/ 名詞
 引力,重力
 Grav·i·ta·tion n.
 1. The act of gravitating.
 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.
 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.
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 gravitation
      n 1: (physics) the force of attraction between all masses in the
           universe; especially the attraction of the earth's mass
           for bodies near its surface; "the more remote the body
           the less the gravity"; "the gravitation between two
           bodies is proportional to the product of their masses
           and inversely proportional to the square of the distance
           between them"; "gravitation cannot be held responsible
           for people falling in love"--Albert Einstein [syn: gravity,
            gravitational attraction, gravitational force]
      2: movement downward resulting from gravitational attraction;
         "irrigation by gravitation rather than by pumps" [ant: levitation]
      3: a figurative movement toward some attraction; "the
         gravitation of the middle class to the suburbs"