zero-zero

Adjective

zero-zero (not comparable)

1. Pertaining to the ejection of the occupant of an aircraft from a grounded stationary position (i.e. zero altitude and zero airspeed).
   • Test vehicles used during this extensive programme were a launching stand for the zero-zero ejections...1965, Aircraft engineering
   • Both cockpits were enclosed under a large canopy and both crew sat on zero-zero ejector seats.1988, René J. Francillon, McDonnell Douglas aircraft since 1920
2. 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.
   • Category IIIc ILS would enable landings in true zero-zero conditions (where the pilots can see nothing, not even the surface of the runway they're on), but the problem of blind taxiing - a necessary capability in order to make use of ILS-IIIc - remains unsolved.
3. Involving neither of two powers increasing their stockpile of nuclear weapons.
   • a zero-zero treaty