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From: Webster's Revised Unabridged Dictionary (1913)

 Gram, Gramme, n.  The unit of mass or weight in the metric system.  It was intended to be exactly, and is very nearly, equivalent to the weight in a vacuum of one cubic centimeter of pure water at its maximum density.  It is equal to 15.432 grains. See Grain, n., 4.
 Gram degree, or Gramme degree Physics, a unit of heat, being the amount of heat necessary to raise the temperature of one gram of pure water one degree centigrade.
 Gram equivalent Electrolysis, that quantity of the metal which will replace one gram of hydrogen.