v. & n.
--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)