1. A person who receives a mandate or is appointed to act on behalf of another; a mandatory
The mandatary was responsible for implementing the council's decisions.
O mandatário era responsável pela implementação das decisões do conselho.
2. In international law, a country or entity entrusted with the administration of a territory
The United Nations mandatary oversaw the transitional government.
O mandatário das Nações Unidas supervisionava o governo de transição.