contagion - definition and synonyms

noun 

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/kənˈteɪdʒ(ə)n/
singularcontagion
pluralcontagions
  1. 1
    [uncountable] medical a situation in which a disease can be spread from one person or animal to another through touch or through the air
    1. a.
      [countable] medical a disease that can be spread from one person to another through touch or through the air
  2. 2
    [singular] formal a situation in which feelings or ideas spread very quickly from one person or place to another
  3.   From our crowdsourced Open Dictionary
    3
    the spread of financial failure from one country to anotherSubmitted from United Kingdom on 23/11/2010