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.
Origin of observer
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
a person or thing that observes
a person who attends a conference solely to note the proceedings
a person trained to identify aircraft, esp, formerly, a member of an aircrew
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
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.
Online Etymology Dictionary, © 2010 Douglas Harper