someone or something that observes.
a delegate to an assembly or gathering, who is sent to observe and report but not to take part officially in its activities.
U.S. Air force.
a member of an aircrew, other than the pilot, holding an aeronautical rating.
a person who maintains observation in an aircraft during flight.
Also called air observer, aircraft observer. U.S. Army. a person who serves in an aircraft as a reconnoiterer and directs artillery fire.

1545–55; observe + -er1

observership, noun
interobserver, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
observer (əbˈzɜːvə)
1.  a person or thing that observes
2.  a person who attends a conference solely to note the proceedings
3.  a person trained to identify aircraft, esp, formerly, a member of an aircrew

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

1550s, "one who keeps a rule, custom, etc.," from observe. Meaning "one who watches and takes notice" is from 1580s; this is the sense of the word in many newspaper names.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
There are so many different layers of animal care that might not be obvious to
  the casual observer.
To be up there in the cold and the dark, riding in the observer's cage and
Surveying the serried ranks of people, one observer said they were jammed so
And so, rock climbing is not really mind over matter, even if it looks that way
  to the admiring observer.
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