nan·o·sec·ond

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

Origin:
1955–60; nano- + second2

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
nanosecond (ˈnænəʊˌsɛkənd) [Click for IPA pronunciation guide]
 
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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00:10
Nanosecond is always a great word to know.
So is flibbertigibbet. Does it mean:
a chattering or flighty, light-headed person.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
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
Every nanosecond of this production was eloquent with craft and wit.
Nor do the conspiracy theories deserve a nanosecond's attention.
Arugula, which seems to go from up to bolt in a nanosecond, is sown every ten
  days.
Data can be written and read in less than a nanosecond.
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