Jettison Definition

jĕtĭ-sən, -zən
jettisoned, jettisoning, jettisons
verb
To throw (goods) overboard.
Webster's New World
To discard (something) as useless or a burden.
Webster's New World

To eject from a boat, submarine, aircraft, spaceship or hot-air balloon, so as to lighten the load.

The ballooners had to jettison all of their sand bags to make it over the final hill.
The jettisoning of fuel tanks.
Wiktionary
Antonyms:
noun
The act of discarding or casting overboard.
American Heritage
A throwing overboard of goods to lighten a ship, airplane, etc. in an emergency.
Webster's New World
Jetsam.
American Heritage
Webster's New World

(uncountable) Collectively, items that have been or are about to be ejected from a boat or balloon.

Wiktionary

Other Word Forms of Jettison

Noun

Singular:
jettison
Plural:
jettisons

Origin of Jettison

  • From Middle English jetteson a throwing overboard of goods to lighten ship from Anglo-Norman getteson from Vulgar Latin iectātiō iectātiōn- from iectātus past participle of *iectāre to throw jet2

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Anglo-Norman getteson, from Old French getaison (French: would be *jetaison like pendaison). Cognate to jetsam

    From Wiktionary

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