from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Of or relating to a function.
  • adj. Of, relating to, or indicating a mathematical function or functions.
  • adj. Designed for or adapted to a particular function or use: functional architecture.
  • adj. Capable of performing; operative: a functional set of brakes.
  • adj. Pathology Involving functions rather than a physiological or structural cause.
  • n. A linear function on vectors whose values are scalars.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. In good working order.
  • adj. Useful; serving a purpose, fulfilling a function
  • adj. Only for functional purposes, notably in architecture
  • adj. Having semantics defined purely in terms of mathematical functions, without side-effects.
  • adj. 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.
  • 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.
  • n. (functional analysis) A scalar-valued linear function on a vector space
  • n. An object encapsulating a function pointer (or equivalent).

from the GNU version of the Collaborative International Dictionary of English

  • adj. Pertaining to, or connected with, a function or duty; official.
  • adj. Pertaining to the function of an organ or part, or to the functions in general; involving or affecting function rather than physiology. See functional disease, below.
  • adj. Designed for or capable of a particular function or use.
  • adj. Fit or ready for use or service; useable; in working order. Antonym of out of order and nonfunctional.
  • adj. Designed to emphasize practical utility rather than artistic or aesthetic purposes.

from The Century Dictionary and Cyclopedia

  • Pertaining to functions; relating to some office or function.
  • Pertaining to an algebraical operation: as, a functional symbol.
  • Having the function usual to the part or organ: as, functional wings of an insect (that is, those used for flying).

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. (of e.g. a machine) performing or capable of performing
  • adj. fit or ready for use or service
  • adj. designed for or adapted to a function or use
  • adj. involving or affecting function rather than physiology
  • adj. designed for or capable of a particular function or use
  • adj. relating to or based on function especially as opposed to structure


from Wiktionary, Creative Commons Attribution/Share-Alike License

function +‎ -al


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  • In this paper, the term functional ingredients refers to substances purported to improve bodily functioning that are added to traditional foods through a manufacturing or other process.

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  • It is important here that I clarify how I am using the term functional in this context.

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  • You probably noticed that the term functional programming has appeared in many areas recently - the C# 3.0 and LINQ have been largely influenced by this paradigm and many of the libraries that enable and simplify writing parallel code rely on functional ideas.

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  • The first time I heard the term functional construction was when I was writing the LINQ to XML section of my book LINQ Unleashed: for C# from Sams.

  • Although the term functional might in your mind be somewhat a limiting factor, the good thing about F# is that it supports object-oriented constructs, and also has full access to the.


  • Mr. Nida used native speakers to produce what he called "functional equivalence"—translations that are true to the spirit rather than the literal words, as had been the rule in earlier times.

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  • We also increasingly find ourselves involved in what we call functional cooperation.

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  • This disease is nothing but what we call a functional nervous trouble.

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  • I think the advance of brain imaging and what we call functional brain imaging, seeing what your brain is doing while we challenge it, has really clarified a lot of what's happening.

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