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English definition of “contagious”

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contagious

adjective  /kənˈteɪ·dʒəs/ us  
(of a disease) able to be caught by touching someone with the disease or something the person has touched or worn, or (of a person) having this type of disease: a highly contagious strain of flu fig. Contagious also means moving easily from one person to another: The mood was contagious, and soon everyone was laughing.
(Definition of contagious from the Cambridge Academic Content Dictionary © Cambridge University Press)
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