Main entry: functional
Definition: designed for or capable of a particular function or use
Usage: a style of writing in which every word is functional; functional architecture
Antonyms: nonfunctional
Definition: not having or performing a function
Antonyms: useless
Definition: having no beneficial use or incapable of functioning usefully
Main entry: functional
Definition: involving or affecting function rather than physiology
Usage: functional deafness
Antonyms: organic
Definition: involving or affecting physiology or bodily organs
Main entry: functional, operative, running, working
Definition: (of e.g. a machine) performing or capable of performing
Usage: in running (or working) order; a functional set of brakes
Antonyms: nonfunctional, malfunctioning
Definition: not performing or able to perform its regular function
Main entry: functional
Definition: designed for or adapted to a function or use
Usage: functional education selects knowledge that is concrete and usable rather than abstract and theoretical; functional architecture
Antonyms: impractical
Definition: not practical; not workable or not given to practical matters
Main entry: usable, useable, functional, operable, operational
Definition: fit or ready for use or service
Usage: 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
Antonyms: unserviceable
Definition: not ready for service