Definition of official birthday in English:

official birthday

Line breaks: of|fi¦cial birth|day

Entry from British & World English dictionary

noun

(In the UK) a day in June chosen for observing the sovereign’s birthday.

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Word of the day middlescent
Pronunciation: ˌmɪdəˈlɛs(ə)nt
adjective
middle-aged, but still maintaining youthful interests and activities