Definition of infectious adjective from the Oxford Advanced American Dictionary

      

    infectious

     adjective
    adjective
    NAmE//ɪnˈfɛkʃəs//
     
     
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  1. 1 an infectious disease can be passed easily from one person to another, especially through the air they breathe The flu is highly infectious. (figurative) infectious laughter
  2. 2[not usually before noun] if a person or an animal is infectious, they have a disease that can be spread to others I'm still infectious. compare contagious
infectiously
 
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adverb to laugh infectiously
infectiousness
 
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noun [uncountable]
See the Oxford Advanced Learner's Dictionary entry: infectious