—v.tr.
1 a throw (esp. heavy material) overboard to lighten a ship, hot-air balloon, etc. b drop (goods) from an aircraft.
2 abandon; get rid of (something no longer wanted).
—n. the act of jettisoning.
Etymology: ME f. AF getteson, OF getaison f. L jactatio -onis f. jactare throw: see JET(1)
Useful english dictionary. 2012.