"functional" in the adjective sense

1. functional

designed for or capable of a particular function or use

"a style of writing in which every word is functional"

"functional architecture"

2. functional

involving or affecting function rather than physiology

"functional deafness"

3. functional

relating to or based on function especially as opposed to structure it is a functional one"

"the problem now is not a constitutional one

"delegates elected on a functional rather than a geographical basis"

4. 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"

5. 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"

6. running, operative, functional, working

of e.g. a machine) performing or capable of performing

"in running (or working) order"

"a functional set of brakes"

Source: WordNet® (An amazing lexical database of English)

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