1. adjective /ˈnæʃənəl/
Of or having to do with a nation or a nation state; relating to a whole country.
Import tariffs were raised for the national interest.
2. noun /ˈnæʃənəl/
The diplomats were advised not to interact with any foreign nationals except on official duty.
b) A tournament in which participants from all over the nation compete.
After winning the regional tournament, the team advanced to the nationals.
Wikipedia foundation.