[gig-uh-hurts, jig-]
noun, plural gigahertz, gigahertzes.
one billion hertz. Abbreviation: GHz

1960–65; giga- + hertz Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
gigahertz (ˈɡɪɡəˌhɜːts, ˈdʒɪɡ-)
n , pl -hertz
GHz a unit of frequency equal to 109 hertz

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Science Dictionary
gigahertz   (gĭg'ə-hûrtz')  Pronunciation Key 
A unit of frequency equal to one billion (109) hertz.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Computing Dictionary

GigaHertz definition

(GHz) Billions of cycles per second.
The unit of frequency used to measure the clock rate of modern digital logic, including microprocessors.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
Instead, it's the gigahertz that are hot in a thriller that treats technology as its biggest turn-on.
Currently, the fastest transistors--found in telecommunication technology--are clocked at a couple hundred gigahertz.
In high-energy accelerators, switching the voltage happens several billion times per second, or gigahertz frequencies.
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