noun
long-term national policy; permanent national policy
A set phrase referring to a far-sighted, enduring policy for the nation, often used in political or philosophical contexts.
教育は国家百年の計である。
Education is a long-term national policy.
A fixed compound of 国家 (nation), 百年 (one hundred years), and 計 (plan/policy), literally 'a hundred-year plan for the nation'.