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English definition of “contagious”

contagious

adjective uk   /kənˈteɪ.dʒəs/ us  
describes a disease that can be caught by touching someone who has the disease or a piece of infected clothing: The infection is highly contagious, so don't let anyone else use your towel. describes someone who has a contagious disease: Keep him off school till he stops being contagious. A contagious feeling spreads quickly among people: Fear is contagious.
(Definition of contagious from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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