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Billion is a name for a large number. It may refer specifically to:

  • 1,000,000,000 (109, one thousand million), the short scale definition. It is used in both British and American English. The short scale has been officially used in the United Kingdom since 1974.
  • 1,000,000,000,000 (1012, one million million), the long scale definition used formerly in the United Kingdom and currently in some other countries.

Billion may also refer to: