Definition of

Billion

Usually means a thousand million. 1,000 x 1,000,000 = 1,000,000,000

Written as a 1 followed by 9 zeros.
Or using scientific notation as: 1 × 109

In some countries such as the UK it could mean a million million 1,000,000 x 1,000,000 = 1,000,000,000,000 (A 1 followed by 12 zeros, or 1 × 1012)

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