Definition of infectiousness noun from the Oxford Advanced Learner's Dictionary

     

    infectiousness

     noun
    noun
    BrE BrE//ɪnˈfekʃəsnəs//
     
    ; NAmE NAmE//ɪnˈfekʃəsnəs//
     
    [uncountable]
     
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  1. 1the ability of a disease to be passed easily from one person to another, especially through the air they breathe
  2. 2the fact that somebody's actions or feelings cause other people to do or feel the same the infectiousness of his humour