Definition of g abbreviation from the Oxford Advanced American Dictionary

      

    g

     abbreviation
    abbreviation
     
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  1. 1gram(s) 3g vitamin C
  2. 2
    NAmE//dʒi//
     
    (technology) gravity or a measurement of the force with which something moves faster through space because of gravity Spacecraft that are re-entering the earth's atmosphere are affected by g forces.
See the Oxford Advanced Learner's Dictionary entry: g