infectious - definition and synonyms


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  1. 1
    an infectious disease is one that can spread from one person to another

    The condition is highly infectious.

    1. a.
      used about a person or animal that has an infectious disease

      The animals were still infectious when they arrived.

  2. 2
    feelings or ways of behaving that are infectious make other people feel the same or behave in the same way

    an infectious laugh

    His enthusiasm was infectious.

derived words