infectious Meaning in the Cambridge English Dictionary Cambridge dictionaries logo
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Meaning of “infectious” in the English Dictionary

"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 ​isolationperiod, ​Ebolasurvivors 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 Learner’s Dictionary & Thesaurus © Cambridge University Press)

"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 ​quicklyspreads or ​influencesothers: an infectious ​laugh
(Definition of infectious from the Cambridge Academic Content Dictionary © Cambridge University Press)
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