n. An authenticated official report concerning some public event, such as military operations, the health of a sovereign or other distinguished personage, etc., issued for the information of the public.n. Any notice or public announcement, especially of news recently received.n. A name given to various periodical publications recording the proceedings of learned societies.To make known by a bulletin publicly posted.n. The bulletin published by the chief signal officer of the United States army from 1875 to 1889, containing the daily reports and charts and monthly and annual summaries of the international simultaneous meteorological observations for the whole northern hemisphere.