Etymology
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expendable (adj.)

1805, "that can be consumed by use," from expend + -able. By 1942 in the military sense, especially of men, "that may be sacrificed to attain an objective."

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Definitions of expendable

expendable (adj.)
suitable to be expended;
expendable (adj.)
(used of funds) remaining after taxes;
Synonyms: spendable
From wordnet.princeton.edu