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English definition of “infectious”

infectious

adjective uk   /ɪnˈfek.ʃəs/ us  
C2 able to pass a disease from one person, animal, or plant to another: an infectious disease/patient C2 describes something that has an effect on everyone who is present and makes them want to join in: an infectious laugh infectious enthusiasm
(Definition of infectious from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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