noun
state of national emergency
Formal term used in legal, political, or news contexts to refer to a declared national emergency.
政府は国家非常事態を宣言した。
The government declared a state of national emergency.
緊急事態 is a broader term for any emergency situation, while 国家非常事態 specifically refers to a national-level emergency declared by the state.
Compound of 国家 (nation) + 非常 (emergency) + 事態 (situation).