functional

The definition of functional is something that is useful for its intended purpose.

(adjective)

A saw that works to cut things is an example of a functional saw.

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See functional in Webster's New World College Dictionary

adjective

  1. of or relating to a function or functions
    1. performing or able to perform a function
    2. useful or intended to be useful
  2. Med. affecting a function of some organ without apparent structural or organic changes: a functional disease

Related Forms:

See functional in American Heritage Dictionary 4

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

Related Forms:

  • funcˈtion·al·ly adverb

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