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observer

[uh b-zur-ver]
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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.
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Origin of observer

First recorded in 1545–55; observe + -er1
Related formsob·serv·er·ship, nounin·ter·ob·serv·er, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for interobserver

observer

noun
  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
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for interobserver

observer

n.

1550s, "one who keeps a rule, custom, etc.," agent noun from observe. Meaning "one who watches and takes notice" is from 1580s; this is the sense of the word in many newspaper names.

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Online Etymology Dictionary, © 2010 Douglas Harper