The difference between Discard and Jettison
When used as nouns, discard means anything discarded, whereas jettison means collectively, items that have been or are about to be ejected from a boat or balloon.
When used as verbs, discard means to throw away, to reject, whereas jettison means to eject from a boat, submarine, aircraft, spaceship or hot-air balloon, so as to lighten the load.
check bellow for the other definitions of Discard and Jettison
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Discard as a verb (transitive):
to throw away, to reject.
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Discard as a verb (intransitive, card games):
To make a discard; to throw out a card.
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Discard as a verb:
To dismiss from employment, confidence, or favour; to discharge.
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Discard as a noun:
Anything discarded.
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Discard as a noun:
A discarded playing card in a card game.
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Discard as a noun (programming):
A temporary variable used to receive a value of no importance and unable to be read later.
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Jettison as a noun (uncountable):
Collectively, items that have been or are about to be ejected from a boat or balloon.
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Jettison as a noun (countable):
The action of jettisoning items.
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Jettison as a verb:
To eject from a boat, submarine, aircraft, spaceship or hot-air balloon, so as to lighten the load.
Examples:
"The ballooners had to jettison all of their sand bags to make it over the final hill."
"The jettisoning of fuel tanks''."
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Jettison as a verb:
To let go or get rid of as being useless or defective; discard.