- present participle of function.
functioning
Americanadjective
-
performing a specified action or activity; working; operating.
My son has only one functioning kidney.
-
(of a person with addiction or other illness or disability) able to cope with everyday life, as at home or at work: functioning diabetics.
a functioning alcoholic with a successful career;
functioning diabetics.
Etymology
Origin of functioning
First recorded in 1835–40; in 1970–75 functioning for def. 2; function ( def. ) (in the sense “to perform an action”) + -ing 2 ( def. )
Explanation
Something that is functioning is working — doing what it's supposed to do. A functioning refrigerator keeps your food cold. A functioning television shows a clear picture. A functioning group gets things done in an orderly and timely fashion. A function is the purpose that something is made for. A flashlight's function is to light up. But if it's not functioning, or working properly, you might need to change its batteries or buy a new one. If your car can get you from point A to point B but the engine sounds like it's going to die any minute, you might say that it is "barely functioning." Sometimes people use the word functional to mean the thing as functioning.
Vocabulary lists containing functioning
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
CME provides many products needed for the normal functioning of financial markets.
From The Wall Street Journal ● Aug. 6, 2026
To investigate how defects in this gene might cause disc disease, researchers from the Universities of Edinburgh and Bristol studied zebrafish bred without a functioning copy of it.
From Science Daily ● Aug. 6, 2026
The firm said three nuclear reactors operating in the region at the time were functioning normally.
From Barron's ● Jul. 28, 2026
It is Exhibit A. A guarantee that demands this much luck, money, and endurance before a court will enforce it has not been functioning as a guarantee.
From Slate ● Jul. 28, 2026
Here, in this microcosm, we must look for those factors that somehow shift the marvelously functioning mechanisms of the cell out of their normal patterns.
From "Silent Spring" by Rachel Carson
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
