Definition of function key in English:

function key

Syllabification: func·tion key

noun

Computing
  • A button on a computer keyboard, distinct from the main alphanumeric keys, to which software can assign a particular function.
    More example sentences
    • You use the four way key to select a function, and more importantly the right function key to choose functions.
    • To get around that, map an unused function key to run the program.
    • When the system is booted up and is showing the login screen, press and hold the Ctrl-Alt keys and press the F1 function key.

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