Definition of jettison
- jettison Noun Collectively, items that have been or are about to be ejected from a boat or balloon.
- jettison Noun The action of jettisoning items.
- jettison Verb To eject from a boat, submarine, aircraft, spaceship or hot-air balloon, so as to lighten the load.
- jettison Verb To let go or get rid of as being useless or defective; discard.