A person who takes on the responsibilities of a chairman in his absence(noun)
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Use "vice chairman" in a sentence
"Unfinished projects like the steel mill and the Aceh petrochemical plant were taken out of the control of Pertamina and put in the hands of J. B. Sumarlin, minister of state for administrative reform and vice chairman of BAPPENAS, the national planning agency."
"Raymond Buckley, the vice chairman of the Democratic Party in New Hampshire, casually compared phone jamming to murder."
"Finally, Rhoney said, I had to go to the vice chairman and say, ‘We can’t keep charging for that."