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billion

1. one thousand million: it is written as 1 000 000 000 or 109
2. (formerly, in Britain) one million million: it is written as 1 000 000 000 000 or 1012
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Billion

 

(in Russian, usually milliard), a thousand millions; a number represented by the figure 1 followed by nine zeros—that is, the number 109 In certain countries (for example, Germany), a billion is a number equal to 1012.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

billion

[′bil·yən]
(mathematics)
The number 109.
In British usage, the number 1012.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

billion

One thousand millions, or 1 followed by nine zeros (10 to the 9th power). In long scale usage, billion refers to a million millions, or 1 followed by 12 zeros (10 to the 12th power). See space/time and long scale.
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
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