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 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.This is one thousand times larger than the short scale billion ... More @Wikipedia
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