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

From the Greek word gígāsgiant
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use giga- in a sentence

  • Each number received minute attention, the Giga being played by Ethelbert Nevin.

    Piano Mastery|Harriette Brower
  • The name comes from Giga (Geige), a sort of fiddle in use during the 12th and 13th centuries.

    Shakespeare and Music|Edward W. Naylor

British Dictionary definitions for giga-

/ (ˈɡɪɡə, ˈɡaɪɡə) /

combining form
denoting 10 9gigavolt Symbol: G
(in computer technology) denoting 2 30gigabyte

Word Origin for giga-

from Greek gigas giant
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

Medical definitions for giga-


One billion (109):gigahertz.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for giga-


A prefix that means:
One billion (109), as in gigahertz, one billion hertz.
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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.