from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The quality of being functional.
  • noun A useful function within a computer application or program.
  • noun The capacity of a computer program or application to provide a useful function.

from The Century Dictionary.

  • noun The state of having or being a function.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun The ability to perform a task or function; that set of functions that something is able or equipped to perform.
  • noun US, law In United States trademark law, the tendency of a product design to serve a function other than identification of the product, preventing that design from being protected as a trademark.
  • noun organic chemistry The presence of a functional group

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun capable of serving a purpose well


from Wiktionary, Creative Commons Attribution/Share-Alike License

From functional +‎ -ity.


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  • "Our scientists are not only looking at how they can feed Australians but also ensure there is global food security which brings stability to nations, but it's also about how we can improve the functionality of foods which will provide good health outcomes."

    - Tim Mulherin, quoted in Forum focuses on international food security,, 10 August 2009.

    August 10, 2009