noun
A place where large numbers of people, especially political prisoners or members of persecuted minorities, are deliberately imprisoned in a relatively small area with inadequate facilities, sometimes to provide forced labor or to await mass execution.
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During World War II, millions of people were imprisoned in concentration camps by the Nazi regime.
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I can't believe my great-grandfather survived a concentration camp during the war.
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That party was so crowded, it felt like a concentration camp in there.
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Being stuck in traffic for hours felt like being in a concentration camp.