vice-chairman

UK: /ˌvaɪsˈtʃɛə^rmən/ US: (vīs′châr′mən)

WordReference Random House Unabridged Dictionary of American English © 2025

vice-chair•man  (vīs′châr′mən), n., pl. -men. 

1. a member of a committee, board, group, etc., designated as immediately subordinate to a chairman and serving as such in the latter's absence;
   a person who acts for and assists a chairman.

• 1855–60

Collins Concise English Dictionary © HarperCollins Publishers::

vice-chairman noun ( -men)

1. a person who deputizes for a chairman and serves in his or her place during his or her absence or indisposition

ˌvice-ˈchairmanship noun