trib·une 1 
(tr
ĭb
y
n
′, tr
ĭ-by
n
)
n.1. An officer of ancient Rome elected by the plebeians to protect their rights from arbitrary acts of the patrician magistrates.
2. A protector or champion of the people.
[Middle English, from Old French tribun, from Latin tribūnus, from tribus, tribe; see TRIBE.]
tribu·nar′y (trĭbyə-nĕr′ē) adj.