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Subject to use or consumption: an expendable source.
(adjective)
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Not worth salvaging or reusing: expendable rocket boosters.
(adjective)
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Not strictly necessary; dispensable: an expendable budget item; expendable personnel.
(adjective)
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Open to sacrifice in the interests of gaining an objective, especially a military one: expendable civilian targets.
(adjective)
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Something expendable.
(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.