a combining form meaning “billion,” used in the formation of compound words: gigabyte.

< Greek gígās giant Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
giga- (ˈɡɪɡə, ˈɡaɪɡə)
combining form
1.  G denoting 109: gigavolt
2.  (in computer technology) denoting 230: gigabyte
[from Greek gigasgiant]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

giga- pref.
One billion (109): gigahertz.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
  1. A prefix that means:

  2. One billion (109), as in gigahertz, one billion hertz.

  3. 230 (that is, 1,073,741,824), which is the power of 2 closest to a billion, as in gigabyte.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Computing Dictionary

giga- definition


The Free On-line Dictionary of Computing, © Denis Howe 2010
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