English

Definition of trillion number from the Oxford Advanced Learner's Dictionary

     

    trillion

     number
    number
    BrE BrE//ˈtrɪljən//
     
    ; NAmE NAmE//ˈtrɪljən//
     
     
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  1. 11 000 000 000 000; one million million You say a, one, two, several, etc. trillion without a final ‘s’ on ‘trillion’. Trillions (of…) can be used if there is no number or quantity before it. Always use a plural verb with trillion or trillions.
  2. 2a trillion, trillions (of…) (informal) a very large amount There are more examples of how to use numbers at the entry for hundred.
  3. 3(old-fashioned, British English) one million million million; 1 000 000 000 000 000 000
  4. Word Origin late 17th cent.: from French, from million, by substitution of the prefix tri- ‘three’ for the initial letters.
See the Oxford Advanced American Dictionary entry: trillion