[{"Bold_text": "noun", "List Items": ["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 an aircraft during flight.", "a member of an aircrew, other than the pilot, holding an aeronautical rating.", "a person who maintains observation an aircraft during flight.", "Also calledair observer,U.S. Army.a person who serves in an aircraft as a reconnoiterer and directs artillery fire."]}]