of or relating to a function or functions:
functional difficulties in the administration.
capable of operating or functioning:
When will the ventilating system be functional again?
having or serving a utilitarian purpose; capable of serving the purpose for which it was designed:
functional architecture; a chair that is functional as well as decorative.
Also, functionalistic. (of a building or furnishing) constructed or made according to the principles of functionalism or primarily as a direct fulfillment of a material need.
Medicine/Medical. without a known organic cause or structural change:
a functional disorder.
Compare organic (def 5).
pertaining to an algebraic operation:
a functional symbol.
Linguistics. (of linguistic analysis, language teaching, etc.) concerned with the communicative role of language rather than, in addition to, or as the framework for its formal structure.
Mathematics. a function that has a domain whose elements are functions, sets, or the like, and that assumes numerical values.
of, involving, or containing a function or functions
practical rather than decorative; utilitarian: functional architecture
capable of functioning; working
(med) affecting a function of an organ without structural change

relating to the purpose or context of a behaviour
denoting a psychosis such as schizophrenia assumed not to have a direct organic cause, like deterioration or poisoning of the brain Compare organic psychosis

(maths) a function whose domain is a set of functions and whose range is a set of functions or a set of numbers

functional func·tion·al (fŭngk’shə-nəl)

Of or relating to a function.

Affecting the physiological function but not the structure.

Affecting bodily functions but not organic structure, as a disorder such as irritable bowel syndrome. Compare organic.


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