A really fast thesaurus... with lots of synonyms.

(adj) :
in good working order; useful; serving a purpose

"that sculpture is not merely artistic, but also functional. It can be used as a hatrack."

(n) :
a function that takes a function as its argument; More precisely: A function y=f(x) whose argument x varies in a space of (real valued, complex valued) functions and whose value belongs to a monodimensional space. An example: the definite integration of integrable real functions in a real interval

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for functional:

(adj) :
in good working order; useful; serving a purpose

"that sculpture is not merely artistic, but also functional. It can be used as a hatrack."

(n) :
a function that takes a function as its argument; More precisely: A function y=f(x) whose argument x varies in a space of (real valued, complex valued) functions and whose value belongs to a monodimensional space. An example: the definite integration of integrable real functions in a real interval