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
The intense press coverage also led to serious investigation of the bystander
  effect by psychologists and sociologists.
Yet in this case, the space agency has chosen to be a bystander.
We don't have any bystander accounts of that moment, but the mechanically
  propelled vehicle probably caused quite a scene.
On the value of her life, on the possibility of saving it, science faded into a
  mute bystander.
Synonyms
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