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Adjective: trillion  tril-yun [N. Amer], tri-lee-un [Brit]
  1. One million million
     
  2. [Brit, archaic] One quintillion
Noun: trillion  tril-yun [N. Amer], tri-lee-un [Brit]
  1. [informal] A very large indefinite number (usually hyperbole)
    "there were trillions of flies";
    - million [informal], billion [informal], zillion [informal], jillion [N. Amer, informal], gazillion [informal], bazillion [N. Amer, informal], bajillion [informal], squillion [informal]
     
  2. The number that is represented as a one followed by 12 zeros
    - one million million, 1000000000000
     
  3. [Brit, archaic] The number that is represented as a one followed by 18 zeros in the UK
    - one million million million [Brit]

Derived forms: trillions

See also: cardinal

Type of: large indefinite amount, large indefinite quantity, large integer

Encyclopedia: Trillion