nanosecond

[nan-uh-sek-uhnd, ney-nuh-]
noun
one billionth of a second. Abbreviation: ns, nsec

Origin:
1955–60; nano- + second2

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Collins
World English Dictionary
nanosecond (ˈnænəʊˌsɛkənd)
 
n
ns one thousand-millionth of a second

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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Etymonline
Word Origin & History

nanosecond
1959, coined from Gk. nanos "dwarf" + second (n.), q.v.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
nanosecond   (nān'ə-sěk'ənd)  Pronunciation Key 
One billionth (10-9) of a second.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
nanosecond [(nan-uh-sek-uhnd)]

A billionth of a second.

Note: The term is often used to refer to a very short time: “He missed having an accident by nanoseconds.”
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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FOLDOC
Computing Dictionary

nanosecond definition

unit
(ns) 10^-9 seconds; one thousand millionth part of a second.
This is the unit in which the fundamental logical operations of modern digital circuits are typically measured. For example, a microprocessor with a clock frequency of 100 megahertz will have a 10 nanosecond clock period.
(1996-11-15)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
Arugula, which seems to go from up to bolt in a nanosecond, is sown every ten
  days.
If it ever did happen, your priorities would change in a nanosecond.
Peeling adhesive tape can create nanosecond bursts of x-rays.
Nor do the conspiracy theories deserve a nanosecond's attention.
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