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An accident, especially one involving serious injury or loss of life.
(noun)
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One injured or killed in an accident: a train wreck with many casualties.
(noun)
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One injured, killed, captured, or missing in action through engagement with an enemy. Often used in the plural: Battlefield casualties were high.
(noun)
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One that is harmed or eliminated as a result of an action or a circumstance: The corner grocery was a casualty of the expanding supermarkets.
(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.