[ fuhngk-shuh-nl ]
/ ˈfʌŋk ʃə nl /



Mathematics. a function that has a domain whose elements are functions, sets, or the like, and that assumes numerical values.

Origin of functional

First recorded in 1625–35; function + -al1

OTHER WORDS FROM functional Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for functional

British Dictionary definitions for functional

/ (ˈfʌŋkʃənəl) /


of, involving, or containing a function or functions
practical rather than decorative; utilitarianfunctional architecture
capable of functioning; working
med affecting a function of an organ without structural change
  1. relating to the purpose or context of a behaviour
  2. denoting a psychosis such as schizophrenia assumed not to have a direct organic cause, like deterioration or poisoning of the brainCompare 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

Derived forms of functional

functionally, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for functional

[ fŭngkshə-nəl ]


Of or relating to a function.
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.

Scientific definitions for functional

[ fŭngkshə-nəl ]

Affecting bodily functions but not organic structure, as a disorder such as irritable bowel syndrome. Compare organic.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.