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observer

[uh b-zur-ver] /əbˈzɜr vər/
noun
1.
someone or something that observes.
2.
a delegate to an assembly or gathering, who is sent to observe and report but not to take part officially in its activities.
3.
U.S. Air Force.
  1. a member of an aircrew, other than the pilot, holding an aeronautical rating.
  2. a person who maintains observation in an aircraft during flight.
4.
Also called air observer, aircraft observer. U.S. Army. a person who serves in an aircraft as a reconnoiterer and directs artillery fire.
Origin
1545-1555
1545-55; observe + -er1
Related forms
observership, noun
interobserver, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin and History for interobserver
observer
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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