also: てっこく
noun, noun which may take the genitive case particle 'no'
enemy nation; hostile country
Refers to a country that is an enemy in a military, political, or competitive context. Can be used attributively with の.
その国は長年、我が国の敵国だった。
That country was our enemy nation for many years.
敵国のスパイが捕まった。
A spy from the enemy country was captured.