g in WordNet English dictionary

1. the 7th letter of the Roman alphabet
   G  g 
   
2. the 7th letter of the Roman alphabet
   G  g 
   
3. a metric unit of weight equal to one thousandth of a kilogram
   gram  gramme  gm  g 
   
4. a unit of force equal to the force exerted by gravity; used to indicate the force to which a body is subjected when it is accelerated
   g  gee  g-force 
   

g in Webster's English dictionary