complication
noun
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the act or process of complicating
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puzzling complexitycomplicatednessknottinesstortuousness
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a development that complicates a situationramification
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a situation or condition that is complex or confused“Their arrival was a serious complication.”
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any disease or disorder that occurs during the course of (or because of) another disease“bed sores are a common complication in cases of paralysis”