1. A competition or tournament open to participants from multiple countries, determining the world champion or top competitor in a particular sport or activity
The FIFA World Cup is the most prestigious international championship in football.
A Copa do Mundo FIFA é o campeonato internacional mais prestigioso do futebol.
2. A sporting event where representatives from different nations compete at the highest level
She won three medals at the international championship for swimming.
Ela ganhou três medalhas no campeonato internacional de natação.