Definition of observer

Definition of observer
  1. observer Noun One who makes observations, monitors or takes notice
  2. observer Noun One who adheres or follows laws, guidelines, etc.
  3. observer Noun A person sent as a representative, to a meeting or other function to monitor but not to participate
  4. observer Noun A crew member on an aircraft who makes observations of enemy positions or aircraft
  5. observer Noun A sentry etc. manning an observation post
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