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trillion  n 
1 the number represented as one followed by twelve zeros (1012); a million million 
2 (formerly, in Britain) the number represented as one followed by eighteen zeros (1018); a million million million 
3 an exceptionally large but unspecified number  determiner 
4 
a amounting to a trillion 
a trillion stars  
b (as pronoun) 
there are three trillion  
  (C17: from French, on the model of million) 
 trillionth  n, adj