1770–80; < Greek dêmos district, people; cf. demo- Unabridged


[dem-oh] Informal.
noun, plural demos.
demonstration ( defs 4, 6 ).
demonstrator ( def 5 ).
a recording of a new song or of one performed by an unknown singer or singing group, distributed to disc jockeys, recording companies, etc., to demonstrate the merits of the song or performer.
demolition ( def 1 ): He does flooring and demo for a living.
verb (used with object), demoed, demoing.
to try out or exhibit the use of (a product, process, or the like): You can demo the game without downloading or buying it.
to record (a song) to demonstrate the merits of the song or performer.

1935–40; by shortening; see -o


noun, plural Demos. Informal.
a member of the Democratic Party; Democrat.

1785–95, Americanism Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
demo (ˈdɛməʊ)
n , pl -os
1.  short for demonstration
2.  a.  a demonstration record or tape, used for audition purposes
 b.  a demonstration of a prototype system
3.  (US) short for demonstrator

demos (ˈdiːmɒs)
1.  the people of a nation regarded as a political unit
2.  rare the common people; masses
[C19: from Greek: the populace; see deme]

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

short for demonstration (tape, disc, etc.). Music recording given out for promotional purposes, 1963. The word was earlier used to mean public political demonstrations (1936).
Online Etymology Dictionary, © 2010 Douglas Harper
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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
The goal is to have demos of the technology for both aircraft within three
  years and working models ready to go within five years.
There are also a few interesting expansions and demos making appearances.
Meanwhile, he kept writing and performing and giving his demos to every record
  company in town.
There's a certain sameness to chefs' live cooking demos.
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