Published in a gazette or official journal; announced officially through a gazette (verb: past tense); or officially announced or published (adjective).
From 'gazette' plus the past tense suffix '-ed', forming both the past tense of the verb 'gazette' (to publish in a gazette) and an adjective describing something officially published.
In British English, 'gazetted' is still used for official announcements—when someone is knighted or appointed to office, the news is gazetted, showing how old newspaper terminology still survives in official bureaucracy.
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