observer

noun observers

1. One who makes observations, monitors or takes notice. Most impartial observers agreed that Sampras had not served well.

   Similar: beholder, observator, onlooker · Opposite: observee

2. One who adheres or follows laws, guidelines, etc. I shall be an observer of the local customs.
3. A person sent as a representative, to a meeting or other function to monitor but not to participate. The UN sent many observers to the country's first elections.
4. A country or other entity which has limited participation rights within an organization. The Vatican and Palestine have observer status at the UN.
5. A crew member on an aircraft who makes observations of enemy positions or aircraft. The only crew-member to survive the crash was the Canadian observer.
6. A sentry etc. manning an observation post. We waited till dusk when the observers' vision was poorest.
7. Synonym of spotter.

   Similar: spotter