1. An international agreement or set of rules established between three or more countries or parties to govern conduct on a specific matter, typically in the context of environmental, trade, or diplomatic affairs.
The multilateral protocol on climate change was signed by 195 nations.
O protocolo multilateral sobre mudanças climáticas foi assinado por 195 nações.
2. A supplementary agreement or amendment to an existing international treaty involving multiple signatories.
The new multilateral protocol strengthened enforcement mechanisms for the original treaty.
O novo protocolo multilateral fortaleceu os mecanismos de execução do tratado original.