• 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.


  • 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 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).


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