orga - para
- out of ecliptic trajectory
- out of gauge load
- out of plane error
- out of sight flying
- out of silo launch
- out of track propeller
- out of trim force at disengagement
- outage bob
- outage time
- outboard
- outboard motor
- outboard power plant
- outbound
- outbreak
- outcrop
- outcrop of an underground explosion
- outer band
- outer base plate ring
- outer bearing
- outer belt
- outer body cap
- outer clutch drum
- outer gimbal
- outer gimbal axis
- outer guidance shell
- outer hose
- outer limit
- outer limit of the territorial sea
- outer liner
- outer lining of hose
- outer loop
- outer marker
- outer marker beacon
- outer parachute bag
- outer perimeter fleet air defense
- outer planet
- outer planking
- outer security violated light
- outer shroud
- outer solar system probe
