[on-look-er, awn-]
spectator; observer; witness.

1600–10; on + looker, after verb phrase look on Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
onlooker (ˈɒnˌlʊkə)
a person who observes without taking part

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

c.1600, from on + look.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Meanwhile up above, an onlooker waits, scuffing his feet impatiently and
  swinging his trunk from side to side.
After the candidates would shake hands with some onlooker, a volunteer would
  hand him a flyer and say a few quick words.
To this onlooker, the family resemblance was not readily apparent.
He took off his shoes, rolled up his pants and walked out into the water to get
  the onlooker pictures.
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