Definition of Billion

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Billion
Usually means a thousand millions. 1,000 x 1,000,000 = 1,000,000,000 A 1 followed by 9 zeros, 1 × 10⁹ In some countries such as the UK it can mean a million million 1,000,000 x 1,000,000 = 1,000,000,000,000 (A 1 followed by 12 zeros, 1 × 10¹²)