functional functional /ˈfʌŋkʃənəl/

adjective

1. () Designed for or capable of a particular function or use  ( functional )
   designed for or capable of a particular function or use
    A style of writing in which every word is functional
   a style of writing in which every word is functional
    Functional architecture
   functional architecture
   
2. () (pathology) involving or affecting function rather than physiology  ( functional )
   (pathology) involving or affecting function rather than physiology
    Functional deafness
   functional deafness
   
3. (of e.g. a machine) performing or capable of performing  ( functional , operative , running , working )
   (of e.g. a machine) performing or capable of performing
    In running (or working) order
   in running (or working) order
    A functional set of brakes
   a functional set of brakes
   
4. Designed for or adapted to a function or use  ( 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 education selects knowledge that is concrete and usable rather than abstract and theoretical
    Functional architecture
   functional architecture
   
5. Fit or ready for use or service  ( functional , operable , usable , operational , useable )
   fit or ready for use or service
    The toaster was still functional even after being dropped
   the toaster was still functional even after being dropped
    The lawnmower is a bit rusty but still usable
   the lawnmower is a bit rusty but still usable
    An operational aircraft
   an operational aircraft
    The dishwasher is now in working order
   the dishwasher is now in working order
   
6. Relating to or based on function especially as opposed to structure  ( 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
   the problem now is not a constitutional one; it is a functional one
    Delegates elected on a functional rather than a geographical basis
   delegates elected on a functional rather than a geographical basis