1. A sports competition or tournament organized within a single country, involving teams or athletes from that country only
The team won the domestic league championship before competing in the European Cup.
O time venceu o campeonato doméstico antes de competir na Copa Europeia.
2. The primary professional sports league of a country, typically in football/soccer
She plays in the domestic league for her country's top division.
Ela joga no campeonato doméstico da primeira divisão de seu país.