Billion

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A billion is exactly one thousand million, 1,000,000,000, or 109.

U.S. usage Value Former British usage
thousand 103 = 1,000 thousand
million 106 = 1,000,000 million
billion 109 = 1,000,000,000 thousand million or milliard
trillion 1012 = 1,000,000,000,000 billion
quadrillion 1015 = 1,000,000,000,000,000 thousand billion or (very rarely) billiard
quintillion 1018 = 1,000,000,000,000,000,000 trillion
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