trillion in WordNet English dictionary

1. the number that is represented as a one followed by 12 zeros
   "in England they call a trillion a billion"
   trillion  one million million  1000000000000 
   
2. a very large indefinite number (usually hyperbole)
   "there were millions of flies"
   million  billion  trillion  zillion  jillion  gazillion 
   
3. the number that is represented as a one followed by 18 zeros
   "in England they call a quintillion a trillion"
   trillion  one million million million 
   

1. one million million in the United States
   trillion 
   
2. one quintillion in Great Britain
   trillion