flag stateglossary / FLAG STATE flag state. Maritime law. The state under whose flag a ship is registered. • A ship may fly the flag of one state only. [Cases: Shipping2. C.J.S. Shipping § 1.] 词条贡献者 双语律师Julie,国际知名法学院法律专业,擅长翻译各类与证券监管、合规与执法相关的法律文件。