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  1. func·tion key
    IPA[ˈfəNG(k)SHən ˌkē]
  2. noun

    • 1. a button on a computer keyboard, distinct from the main alphanumeric keys, to which software can assign a particular function:

      I can toggle between the two files by pressing a function key
  3. Variation

    • n.: noun: function key, plural noun: function keys