Definition of contagious adjective from the Oxford Advanced American Dictionary

     

    contagious

     adjective
    adjective
    NAmE//kənˈteɪdʒəs//
     
     
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  1. 1a contagious disease spreads by people touching each other Scarlet fever is highly contagious. (figurative) His enthusiasm was contagious (= spread quickly to other people). a contagious laugh
  2. 2[not usually before noun] if a person is contagious, they have a disease that can be spread to other people by touch compare infectious
contagiously
 
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adverb
See the Oxford Advanced Learner's Dictionary entry: contagious