Definition: (DOD, NATO) 1. A combatant unit(s) assigned to accompany and protect another force or convoy. 2. Aircraft assigned to protect other aircraft during a mission. 3. An armed guard that accompanies a convoy, a train, prisoners, etc. 4. An armed guard accompanying persons as a mark of honor. (DOD) 5. To convoy. 6. A member of the Armed Forces assigned to accompany, assist, or guide an individual or group, e.g., an escort officer.