Functionality definitions

fŭngk'shə-năl'ĭ-tē
The quality of being functional.
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A useful function within a computer application or program.
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The capacity of a computer program or application to provide a useful function.
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The quality or state of being functional; usefulness.
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An operation or set of operations performed as by software or by an electronic device.
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The actions (operations), capabilities and usefulness of something such as a software application.
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The ability to perform a task or function; that set of functions that something is able or equipped to perform.
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(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.
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(organic chemistry) The presence of a functional group.

Aldrichimica Acta Volume 30 No 4 (pdf) from Sigma-AldrichThe vinyldiazomethanes that have been commonly used in our studies contain an electron-withdrawing group adjacent to the diazo functionality.

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Origin of functionality

From functional +"Ž -ity.