( BrE ) used at the end of a formal letter before you sign your name, when you have addressed sb as 'Dear Sir/Dear Madam, etc.' and not by their name
YOURS FAITHFULLY
Meaning of YOURS FAITHFULLY in English
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005