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function +‎ -al


functional (comparative more functional, superlative most functional)

  1. In good working order.
  2. Useful; serving a purpose, fulfilling a function
    That sculpture is not merely artistic, but also functional: it can be used as a hatrack.
  3. Only for functional purposes, notably in architecture
    A functional construction element generally must meet higher technical but lower aesthetical requirements
  4. (computing theory) Having semantics defined purely in terms of mathematical functions, without side-effects.
  5. (medicine) 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.




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functional (plural functionals)

  1. (mathematics) 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.
  2. (mathematics, functional analysis) A scalar-valued linear function on a vector space.
  3. (computing) An object encapsulating a function pointer (or equivalent).

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