What is Bulletin?

Legal Definition
An official account of public transactions on matters of importance. In France, it is the registry of the laws.
-- Bouviers Law Dictionary
Legal Definition
An officially published notice or announcement concerning the progress of matters of public importance. In France, the registry of the laws. See Bulletin des lois.
-- Black's Law Dictionary
Legal Definition
A published official report of a matter or fact of public interest.
-- Ballentine's Law Dictionary