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Frank,毕业于英国一流的高级翻译学院,擅长翻译涉及交通物流领域的法律文件。