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verb [transitive] infect pronunciation in British English /ɪnˈfekt/
Word Forms
present tense
present participleinfecting
past tenseinfected
past participleinfected
  1. 1
    [often passive] to make someone get a disease, that can be spread from one person to another

    Thousands of people have been infected.

    If you return to work too soon, you may infect other people.

    be infected with/by something:

    You can only be infected with HIV in a limited number of ways.

    1. a.
      to fill something with bacteria or other substances that spread disease
      infect something with something:

      Terrorists had threatened to infect the water supply with a deadly virus.

  2. 2
    computing if a computer virus infects a computer or computer program, it enters it and causes problems

    a virus that infects word-processing documents


… a teaching method in which groups of children learn independently using a computer linked to the internet

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a derogatory word used for referring to people in the banking and investment industry who are thought of as taking serious risks in order to increase their own earnings …

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