FUNCTIONAL
Definition of FUNCTIONAL
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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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A scalar-valued linear function on a vector space.
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An object encapsulating a function pointer (or equivalent).
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In good working order.
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Useful; serving a purpose, fulfilling a function
"That sculpture is not merely artistic, but also functional: it can be used as a hatrack."
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Only for functional purposes, notably in architecture
"A functional construction element generally must meet higher technical but lower aesthetical requirements"
Source: Wiktionary