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English definition of “infectious”

infectious

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