noun
public administration
Academic field studying government policy implementation and public management.
彼は大学で行政学を専攻している。
He is majoring in public administration at university.
行政 refers to administration or government in general, while 行政学 is specifically the academic study of public administration.
Compound of 行政 (gyōsei, 'administration') and 学 (gaku, 'study'). The exact historical derivation is uncertain, but the term follows the common pattern for academic disciplines.