Definition of trillion number from the Oxford Advanced American Dictionary

     

    trillion

     number
    number
    NAmE//ˈtrɪlyən//
     
    (plural verb)
     
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  1. 1 1,000,000,000,000; 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.
See the Oxford Advanced Learner's Dictionary entry: trillion