bystander

[bahy-stan-der]
noun
a person present but not involved; chance spectator; onlooker.

Origin:
1610–20; by- + stander


observer, viewer, passerby, witness; rubberneck, sidewalk superintendent.
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World English Dictionary
bystander (ˈbaɪˌstændə)
 
n
a person present but not involved; onlooker; spectator

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

bystander
1610s, from by + stand -er (1).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Brain cells thought to be bystanders communicate using chemicals.
You're not allowed to smoke in restaurants anymore because smokers make
  bystanders sick.
And even when it is, any bystanders should have a way of knowing what's coming.
The riot police charge, and bystanders hide in their doorways.
Synonyms
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