Definition of


A thousand millions.

1,000 x 1,000,000 = 1,000,000,000

Which is a 1 followed by 9 zeros

Using scientific notation: 1 × 109

The diameter of the Sun is just over a billion meters

The prefix "giga-" means a billion. Example: a gigameter is a billion meters (one million km), which is a little less then the diameter of the Sun.

(In many non-English speaking countries a billion means a million million, which is a 1 followed by 12 zeros, or 1 × 1012)

Below is a cube made of a million smaller cubes. If each of the small cubes is worth a thousand dollars, then the whole cube is worth a billion dollars.

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