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infectious

adjective
 
 
/ɪnˈfek.ʃəs/

Definition

C2 able to pass a disease from one person, animal, or plant to another: an infectious disease/patientPassing 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 enthusiasmAttractiveSexual attractionSmart and elegant
(Definition of infectious adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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