Prefunctional

adjective
1.
of or relating to a function or functions:
functional difficulties in the administration.
2.
capable of operating or functioning:
When will the ventilating system be functional again?
3.
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.
4.
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.
5.
Medicine/Medical. without a known organic cause or structural change:
a functional disorder.
Compare organic (def 5).
6.
pertaining to an algebraic operation:
a functional symbol.
7.
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.
noun
8.
Mathematics. a function that has a domain whose elements are functions, sets, or the like, and that assumes numerical values.
adjective
1.
of, involving, or containing a function or functions
2.
practical rather than decorative; utilitarian: functional architecture
3.
capable of functioning; working
4.
(med) affecting a function of an organ without structural change
5.
(psychol)

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

noun
6.
(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)
adj.

Of or relating to a function.

Affecting the physiological function but not the structure.

functional
(fŭngk’shə-nəl)
Affecting bodily functions but not organic structure, as a disorder such as irritable bowel syndrome. Compare organic.