observer

Definitions

• One who makes observations, monitors or takes notice
• One who adheres or follows laws, guidelines, etc.
• A person sent as a representative, to a meeting or other function to monitor but not to participate
• A country or other entity which has limited participation rights within an organization.
• (military) A crew member on an aircraft who makes observations of enemy positions or aircraft
• (military) A sentry etc. manning an observation post