Definition of "tribune"

(historical) An elected official in Ancient Rome, a tribune of the plebs.

(historical) A military officer in Ancient Rome ranking below a legate and above a centurion, a military tribune.

(figurative) A protector of the people.  examples

(Christianity, architecture) The domed or vaulted apse in a cathedral housing the bishop's throne (see).  examples

(uncommon) Synonym of pulpit, a platform, a place or opportunity to express one's opinion  examples