a person who upholds or defends the rights of the people.
2.
Roman History.
a.
any of various administrative officers, especially one of 10 officers elected to protect the interests and rights of the plebeians from the patricians.
b.
any of the six officers of a legion who rotated in commanding the legion during the year.
Origin: 1325–75;Middle English < Latintribūnus, derivative of tribustribe
late 14c., "official in ancient Rome," from L. tribunus "magistrate" (specifically one of the officers appointed to protect the rights and interests of the plebeians from the patricians), originally "head of a tribe," from tribus (see tribe). The meaning "raised platform"
is 1762, from It., from L. tribunal "platform for the seats of magistrates in ancient Rome."