[kee-loh, kil-oh]
noun, plural kilos.
(a word used in communications to represent the letter K. )

1865–70; shortened form Unabridged


a Greek combining form meaning “thousand,” introduced from French in the nomenclature of the metric system (kiloliter ); on this model, used in the formation of compound words in other scientific measurements (kilowatt ).

< French, representing Greek chī́lioi a thousand Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
kilo1 (ˈkiːləʊ)
n , pl kilos
kilogram short for kilometre

kilo2 (ˈkiːləʊ)
communications a code word for the letter k

1.  k denoting 10³ (1000): kilometre
2.  (in computer technology) denoting 210 (1024): kilobyte: in computer usage, kilo- is restricted to sizes of storage (e.g. kilobit) when it means 1024; in other computer contexts it retains its usual meaning of 1000
[from French, from Greek khilioi thousand]

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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Word Origin & History

1870, shortening of kilogram. The prefix meaning "one thousand" was introduced in Fr. 1795, when the metric system was officially adopted there, from Gk. khilioi "thousand," of unknown origin. Slang shortening key (in drug trafficking) is attested from 1968.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

kilo- pref.
One thousand (103): kilogram.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
  1. A prefix that means:

  2. One thousand, as in kilowatt, one thousand watts.

  3. 210 (that is, 1,024), which is the power of 2 closest to 1,000, as in kilobyte.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Abbreviations & Acronyms
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Turning biological wastes, dry, or otherwise does not produce a large amount of
  energy per kilo.
Beef production also requires thousands of litres of water per kilo.
He looked around the marketplace and found about a kilo of it for sale.
Their ration cards permitted them only one kilo of sugar and half a liter of
  cooking oil a month.
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