functional

Use the adjective functional to describe something that is made to do a specific job, such as the functional alarm clock feature on a digital stopwatch.

The word functional comes from the Latin word functionem, meaning "performance, execution." It can also describe whether something is working properly. This is what shoppers at a garage sale want to be sure of before they leave with an old television — they plug it in to make sure it's functional. In this case the opposite of functional is useless.

Definitions of functional
  1. adjective
    designed for or capable of a particular function or use
    “a style of writing in which every word is functional
    functional architecture”
    Synonyms:
    structural
    affecting or involved in structure or construction
    useful, utilitarian
    having a useful function
    serviceable
    ready for service or able to give long service
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    Antonyms:
    nonfunctional
    not having or performing a function
    nonstructural
    not structural
    cosmetic, decorative, ornamental
    serving an esthetic rather than a useful purpose
    unserviceable
    not ready for service
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  2. adjective
    designed for or adapted to a function or use
    functional education selects knowledge that is concrete and usable rather than abstract and theoretical”
    functional architecture”
    Synonyms:
    practical
    concerned with actual use or practice
  3. adjective
    fit or ready for use or service
    “the toaster was still functional even after being dropped”
    synonyms: operable, operational, usable, useable
    serviceable
    ready for service or able to give long service
  4. adjective
    (of e.g. a machine) performing or capable of performing
    “a functional set of brakes”
    synonyms: operative, running, working
    functioning
    performing or able to perform its regular function
  5. adjective
    relating to or based on function especially as opposed to structure
    “it is a functional one”
    “delegates elected on a functional rather than a geographical basis”
  6. adjective
    involving or affecting function rather than physiology
    functional deafness”
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    Antonyms:
    organic
    involving or affecting physiology or bodily organs
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