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English definition of “complication”

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complication

noun [C]  /ˌkɑm·plɪˈkeɪ·ʃən/ us  
something that makes a situation more difficult: This complication had not been foreseen. medical A complication is a problem that develops from an existing illness, making treatment more difficult: He died from complications of diabetes.
(Definition of complication from the Cambridge Academic Content Dictionary © Cambridge University Press)
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