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Definition of “infectious” - English Dictionary

"infectious" in American English

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infectiousadjective [not gradable]

 us   /ɪnˈfek·ʃəs/
able to infect someone: infectious diseases
If something is infectious, it quickly spreads or influences others: an infectious laugh
(Definition of infectious from the Cambridge Academic Content Dictionary © Cambridge University Press)







"infectious" in British English

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infectiousadjective

uk   /ɪnˈfek.ʃəs/  us   /ɪnˈfek.ʃəs/
C2 (of a disease) able to be passed one person, animal, or plant to another: an infectious disease
C2 able to pass a disease from one person, animal, or plant to another: an infectious patient After the 21-day isolation period, Ebola survivors are no longer infectious.
C2 Something that is infectious 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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