1. [Adjective]: 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"

2. [Adjective]: designed for or capable of a particular function or use; "a style of writing in which every word is functional"; "functional architecture"

3. [Adjective]: involving or affecting function rather than physiology; "functional deafness"

4. 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"

5. (of e.g. a machine) performing or capable of performing; "in running (or working) order"; "a functional set of brakes"

6. 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"

1. structural

2. utilitarian

3. useful

4. functioning

5. practical

6. serviceable

1. nonfunctional

2. organic