demos

[dee-mos]

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

Dictionary.com Unabridged

demo

[dem-oh] Informal.
noun, plural demos.
1.
demonstration ( defs 4, 6 ).
2.
demonstrator ( def 5 ).
3.
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.
4.
demolition ( def 1 ): He does flooring and demo for a living.
verb (used with object), demoed, demoing.
5.
to try out or exhibit the use of (a product, process, or the like): You can demo the game without downloading or buying it.
6.
to record (a song) to demonstrate the merits of the song or performer.

Origin:
1935–40; by shortening; see -o

Demo

[dem-oh]
noun, plural Demos. Informal.
a member of the Democratic Party; Democrat.

Origin:
1785–95, Americanism

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
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)
 
n
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
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Etymonline
Word Origin & History

demo
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
demo
demonstration
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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