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.

Definition of official birthday in:

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Word of the day hominoid
Pronunciation: ˈhɒmɪnɔɪd
noun
a primate of a group that includes humans…