"a style of writing in which every word is functional"
"the problem now is not a constitutional one; it is a functional one"
"delegates elected on a functional rather than a geographical basis"
"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 education selects knowledge that is concrete and usable rather than abstract and theoretical"
"in running (or working) order"
"a functional set of brakes"
In a good poem imagery and rhythm are functional, not merely decorative.
出自：Times Literary Supplement
Even if there is no anatomical differentiation of the midgut there may be functional differentiation.
出自： R. F. Chapman