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- (number) (ordinal billionth) The number 1,000,000,000 (or 1,000,000,000,000 in old British usage).
- In 2006, China had about 1.3 billion people.
- (countable) The number 1,000,000,000 (or 1,000,000,000,000 in old British usage).
- Billions of dollars have been spent on the war in Iraq.