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a combining form meaning “billion,” used in the formation of compound words:
Origin of giga-
From the Greek word gígās giant Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for giga-


/ˈɡɪɡə; ˈɡaɪɡə/
combining form
denoting 109: gigavolt, G
(in computer technology) denoting 230: gigabyte
Word Origin
from Greek gigasgiant
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for giga-

arbitrary word-forming element meaning "billion" in the metric system, 1947, from Greek gigas "giant" (see giant).

Online Etymology Dictionary, © 2010 Douglas Harper
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giga- in Medicine

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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giga- in Science
  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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