# functional

## Meanings

• In good working order.
• Useful; serving a purpose, fulfilling a function
• Only for functional purposes, notably in architecture
• Having semantics defined purely in terms of mathematical functions, without side-effects.
• Of a disease, such that its symptoms cannot be referred to any appreciable lesion or change of structure; opposed to organic disease, in which the organ itself is affected.

### Noun

• A function that takes a function as its argument; More precisely: A function $y=f\left(x\right)$ whose argument $x$ varies in a space of (real or complex valued) functions and whose value belongs to a monodimensional space. An example is the definite integration of integrable real functions in a real interval.
• A scalar-valued linear function on a vector space.
• An object encapsulating a function pointer (or equivalent).

## Origin

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