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Past tense and past participle of lose.
(verb)
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Unable to find one's way: a lost child.
(adjective)
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No longer in the possession, care, or control of someone or something: a lost pen.
(adjective)
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No longer in existence; vanished or spent: lost youth.
(adjective)
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No longer known or practiced: a lost art.
(adjective)
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.