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A billion is a number with two distinct definitions: 1,000,000,000, i.e. one thousand million, or 10 9 (ten to the ninth power), as defined on the short scale. This is now generally the meaning in both British and American English. 1,000,000,000,000, i.e. one million million, or 10 12 (ten to the twelfth power), as defined on the long scale.
In America, a billion has 9 zero's (1,000,000,000) but in Britain a billion has 12 zero's (1,000,000,000,000) - although ever more commonly the American definition is being used (even in Britain). Source(s): http://www.askoxford.com/asktheexperts/f... TheBaker Â· 9 years ago. Thumbs up. 0.