1.Definition: (of e.g. a machine) performing or capable of performing
"A functional set of brakes"
2.Definition: designed for or adapted to a function or use
"Functional education selects knowledge that is concrete and usable rather than abstract and theoretical", "Functional architecture"
3.Definition: designed for or capable of a particular function or use
"A style of writing in which every word is functional", "Functional architecture"
4.Definition: fit or ready for use or service
"The toaster was still functional even after being dropped"
5.Definition: involving or affecting function rather than physiology
6.Definition: relating to or based on function especially as opposed to structure
"The problem now is not a constitutional one; it is a functional one", "Delegates elected on a functional rather than a geographical basis"