'functioning' definitions:

Definition of 'functioning'

From: WordNet
adjective
Performing or able to perform its regular function; "a functioning flashlight" [ant: malfunctioning, nonfunctional]
noun
Process or manner of functioning or operating; "the power of its engine determines its operation"; "the plane's operation in high winds"; "they compared the cooking performance of each oven"; "the jet's performance conformed to high standards" [syn: operation, functioning, performance]