func·tion·al

[fuhngk-shuh-nl]
adjective
1.
of or pertaining 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, func·tion·al·is·tic. (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.
00:10
Functionality is always a great word to know.
So is quincunx. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a chattering or flighty, light-headed person.

Origin:
1625–35; function + -al1

func·tion·al·i·ty, noun
func·tion·al·ly, adverb
hy·per·func·tion·al, adjective
hy·per·func·tion·al·ly, adverb
mul·ti·func·tion·al, adjective
non·func·tion·al, adjective
non·func·tion·al·ly, adverb
pre·func·tion·al, adjective
sem·i·func·tion·al, adjective
sem·i·func·tion·al·ly, adverb
sub·func·tion·al, adjective
sub·func·tion·al·ly, adverb
su·per·func·tion·al, adjective
un·func·tion·al, adjective
un·func·tion·al·ly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
functional (ˈfʌŋkʃənəl) [Click for IPA pronunciation guide]
 
adj
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
 a.  relating to the purpose or context of a behaviour
 b.  Compare organic psychosis denoting a psychosis such as schizophrenia assumed not to have a direct organic cause, like deterioration or poisoning of the brain
 
n
6.  maths a function whose domain is a set of functions and whose range is a set of functions or a set of numbers
 
'functionally
 
adv

functionality (ˌfʌŋkʃənˈælɪtɪ) [Click for IPA pronunciation guide]
 
n , pl -ities
1.  the quality of being functional
2.  computing a function or range of functions in a computer, program, package, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

functional
as a term in architecture, "utilitarian," 1928 (see function). Related: Functionality.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

functional func·tion·al (fŭngk'shə-nəl)
adj.

  1. Of or relating to a function.

  2. Affecting the physiological function but not the structure.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
American Heritage
Science Dictionary
functional   (fŭngk'shə-nəl)  Pronunciation Key 
Affecting bodily functions but not organic structure, as a disorder such as irritable bowel syndrome. Compare organic.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
FOLDOC
Computing Dictionary

functionality definition

programming
Waffle for "features" or "function". The capabilities or behaviours of a program, part of a program, or system, seen as the sum of its features. Roughly, "the things it can do". Generally used in a comparative sense, e.g. "The latest update adds some useful functionality".
(1997-07-14)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
So, it's really important that cheese has a consistent functionality in these
  finished foods.
We will be releasing this functionality as an over-the-air software update as
  soon as it is ready, in the first half of next year.
Increased expectations of electronic functionality also increases costs.
It does have a certain functionality but population control has nothing to do
  with it.
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