资料来源 : Webster's Revised Unabridged Dictionary (1913)

   3. Importance, significance, dignity, etc; hence,
      seriousness; enormity; as, the gravity of an offense.

            They derive an importance from . . . the gravity of
            the place where they were uttered.    --Burke.

   4. (Physics) The tendency of a mass of matter toward a center
      of attraction; esp., the tendency of a body toward the
      center of the earth; terrestrial gravitation.

   5. (Mus.) Lowness of tone; -- opposed to acuteness.

   {Center of gravity} See under {Center}.

   {Gravity battery}, See {Battery}, n., 4.

   {Specific gravity}, the ratio of the weight of a body to the
      weight of an equal volume of some other body taken as the
      standard or unit. This standard is usually water for
      solids and liquids, and air for gases. Thus, 19, the
      specific gravity of gold, expresses the fact that, bulk
      for bulk, gold is nineteen times as heavy as water.