adjective: (aviation, military) Pertaining to the ejection of the occupant of an aircraft from a grounded stationary position (i.e. zero altitude and zero airspeed).
adjective: (aviation) Pertaining to weather conditions of zero ceiling and zero visibility (i.e., opaque cloud all the way down to ground level), or to aircraft operations in such conditions.
adjective: (military) Involving neither of two powers increasing their stockpile of nuclear weapons.