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interaction

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noun [countable/uncountable] American English pronunciation: interaction /ˌɪntərˈækʃən/ 
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singularinteraction
pluralinteractions
  1. 1
    the activity of being with and talking to other people, and the way that people react to each other
    interaction with:

    I enjoy the constant interaction with people from other departments.

    interaction between:

    the interaction between mother and baby

    social interaction:

    Jobs that involve a degree of social interaction are usually more satisfying.

  2. 2
    the process by which different things affect each other or change each other
    interaction of:

    the interaction of these two medications

    interaction between:

    the interaction between an organism and its environment

    interaction with:

    The mechanism seems to involve interactions with other proteins.

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