- a member of an aircrew, other than the pilot, holding an aeronautical rating.
- a person who maintains observation in an aircraft during flight.
Origin of observer
Examples from the Web for observer
You can put mag wheels on a Gremlin,” commented one long time Michigan observer, “but that doesn't make it a Mustang.
Trierweiler has also expressed regret over the tweet in a recent interview with the U.K. Observer.Hell Hath No Fury Like Valerie Trierweiler, the French President’s Ex|Lizzie Crocker|November 28, 2014|DAILY BEAST
The New York Observer claimed Clark-Flory was the chosen one (she vehemently denied it in an email to The Daily Beast).My Bizarre Night With James Deen, Libertarian Porn Star|Emily Shire|November 12, 2014|DAILY BEAST
“A scary precedent has been set,” she told the Observer back in May.
One observer recalled them hitting the ground “like melons,” as the music piped into the plaza played “How Deep Is Your Love?”
Various reasons, some good and some poor, may be assigned, varying according to political predilections of the observer.Lyman's History of old Walla Walla County, Vol. 1 (of 2)|William Denison Lyman
In consulting it the observer is supposed to face the southeast.Astronomy with an Opera-glass|Garrett Putman Serviss
Tollman himself, the observer would have said, had left nothing to ask.The Tyranny of Weakness|Charles Neville Buck
An observer of such beings as she saw would to-day call them spirits.
Never sober, no man had ever seen him (to the observer's knowledge) drunk.Mr. Claghorn's Daughter|Hilary Trent
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.