1. A language used for communication between people who do not share a native language, especially in trade, diplomacy, or international contexts
English has become the lingua franca of international business.
O inglês tornou-se a língua franca dos negócios internacionais.
2. Any common language or system of communication adopted by diverse groups
Music is a lingua franca that transcends cultural boundaries.
A música é uma língua franca que transcende as fronteiras culturais.