1British a body established to settle certain types of dispute:an industrial tribunal ruled that he was unfairly dismissed
2a court of justice:an international war crimes tribunal
a seat or bench for a judge or judges.
late Middle English (denoting a seat for judges): from Old French, or from Latin tribunal 'raised platform provided for magistrate's seats', from tribunus(see tribune1). sense 1 dates from the early 20th century
tribunal in other Oxford dictionaries
Definition of tribunal in the US English dictionary