the second Saturday in June, the date on which the birthday of the British king or queen is officially celebrated, though it is not his or her real birthday. It is marked by Trooping the Colour and the announcement of the Birthday Honours .
OFFICIAL BIRTHDAY
Meaning of OFFICIAL BIRTHDAY in English
Oxford guide to British and American culture English vocabulary. Руководство по британской и американской культуре, Оксфордский английский словарь. 2005