letters secretglossary / LETTERS SECRET letters secret. Hist. A governmental document that is issued to a private person, closed and sealed, and thus not made available for public inspection. — Also termed letters close. Cf. LETTERS PATENT(1). 词条贡献者 译者Jessie,毕业于亚洲顶尖的高级翻译学院,擅长翻译各种与能源、自然资源与利用相关的法律文件。