functional -- (designed for or capable of a particular function or use; "a style of writing in which every word is functional"; "functional architecture")
functional -- (involving or affecting function rather than physiology; "functional deafness")
functional -- (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")
functional, usable, useable, operable, operational -- (fit or ready for use or service; "the toaster was still functional even after being dropped"; "the lawnmower is a bit rusty but still usable"; "an operational aircraft"; "the dishwasher is now in working order")
functional -- (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")
running, operative, functional, working -- ((of e.g. a machine) performing or capable of performing; "in running (or working) order"; "a functional set of brakes")