gigahertz

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

Origin:
1960–65; giga- + hertz

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
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
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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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FOLDOC
Computing Dictionary

GigaHertz definition

unit
(GHz) Billions of cycles per second.
The unit of frequency used to measure the clock rate of modern digital logic, including microprocessors.
(2001-05-14)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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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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