/ ˈtrɪbjuːn; NAmE / noun
1.
an official elected by the people in ancient Rome to defend their rights; a popular leader
2.
a raised area that sb stands on to make a speech in public
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WORD ORIGIN
sense 1 late Middle English : from Latin tribunus , literally head of a tribe, from tribus tribe.
sense 2 mid 17th cent. (denoting the principal room in an Italian mansion): via French from Italian , from medieval Latin tribuna , alteration of Latin tribunal raised platform provided for magistrate's seats, from tribunus , literally head of a tribe, from tribus tribe.