"functioned" 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"

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

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