"functioning" in the noun sense

1. operation, functioning, performance

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"

"functioning" in the verb sense

1. function, work, operate, go, run

perform as expected when applied

"The washing machine won't go unless it's plugged in"

"Does this old car still run well?"

"This old radio doesn't work anymore"

2. serve, function

serve a purpose, role, or function

"The tree stump serves as a table"

"The female students served as a control group"

"This table would serve very well"

"His freedom served him well"

"The table functions as a desk"

3. officiate, function

perform duties attached to a particular office or place or function

"His wife officiated as his private secretary"

"functioning" in the adjective sense

1. functioning

performing or able to perform its regular function

"a functioning flashlight"

Source: WordNet® (An amazing lexical database of English)

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