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.

Definitions of functioning

adj performing or able to perform its regular function

“a functioning flashlight”
functional, operative, running, working
(of e.g. a machine) performing or capable of performing
(used of computers) operating properly
malfunctioning, nonfunctional
not performing or able to perform its regular function
amiss, awry, haywire, wrong
not functioning properly
bad, defective
not working properly
out of whack
out of balance or out of adjustment
having the spring unwound
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n process or manner of functioning or operating

operation, performance
Type of:
physical process, process
a sustained phenomenon or one marked by gradual changes through a series of states

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