Definition of contagiousness in US English:

contagiousness

noun

  • See contagious

    • ‘Antibiotics shorten the period of contagiousness to 5 days following the start of antibiotic treatment.’
    • ‘He correctly identified seven of the 12 cranial nerves, discovered the valves of the heart, recognized the contagiousness of tuberculosis, and the possible spread of rabies via dogs.’
    • ‘The models also included information about the flu virus, such as the possible contagiousness of an infected person.’
    • ‘Willow soon was laughing too, from the contagiousness of it.’
    • ‘Instead, the extract controls the contagiousness of the virus and stops it from infecting new cells.’

Pronunciation

contagiousness

/kənˈteɪdʒəsnəs//kənˈtājəsnəs/