Definition of vaccine in English:


Syllabification: vac·cine
Pronunciation: /vakˈsēn


  • 1A substance used to stimulate the production of antibodies and provide immunity against one or several diseases, prepared from the causative agent of a disease, its products, or a synthetic substitute, treated to act as an antigen without inducing the disease: there is no vaccine against HIV infection
    More example sentences
    • Immunisation with the influenza vaccine is recommended for asthmatic people.
    • They have proved that a vaccine which immunises against the disease is more likely to work in humans.
    • These children show few adverse reactions to routine vaccinations, including live vaccines.
  • 1.1 Computing A program designed to detect computer viruses and inactivate them.
    More example sentences
    • A vaccine should consume fewer network resources than the virus against which it provides immunity.
    • I have been working on the computer vaccine for five years.
    • Do you have problem with your computer vaccine when it's service period is over?


late 18th century: from Latin vaccinus, from vacca 'cow' (because of the early use of the cowpox virus against smallpox).

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