Noun contagion has 3 senses
  1. contagious disease, contagion - any disease easily transmitted by contact
    --1 is a kind of communicable disease
    --1 has particulars:
     influenza, flu, grippe; measles, rubeola, morbilli; diphtheria; scarlet fever, scarlatina; pox; Vincent's angina, Vincent's infection, trench mouth; venereal disease, VD, social disease, Cupid's itch, Cupid's disease, Venus's curse, sexually transmitted disease
  2. infection, contagion, transmission - an incident in which an infectious disease is transmitted
    --2 is a kind of incident
  3. contagion, infection - the communication of an attitude or emotional state among a number of people; "a contagion of mirth"; "the infection of his enthusiasm for poetry"
    --3 is a kind of communication
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