a brief report (especially an official statement issued for immediate publication or broadcast)
"The station announced that an emergency bulletin regarding the storm was being broadcast immediately to all listeners."
A short report, especially one released through official channels to be broadcast or publicized.
"The emergency services issued a bulletin warning residents to stay indoors due to severe thunderstorms approaching the city."
In plain English: A bulletin is a short notice or announcement that gives important information to a group of people.
"The teacher read an emergency bulletin about the school closure to the parents."
Usage: Use "bulletin" to refer to a concise news update or official announcement distributed to a specific group, such as a weather bulletin or a hospital status report. Avoid using it for general newspapers or magazines, which are better described as publications or journals.
make public by bulletin
"The company decided to make public by bulletin that all employees must wear masks starting next Monday."
To announce something by means of such a report or publication.
"The company will issue a bulletin to announce its new safety protocols later today."
In plain English: To bulletin something means to put up a public notice about it.
"The manager will bulletin any new safety rules on the breakroom wall immediately."
Usage: Do not use "bulletin" as a verb in modern English; it is an archaic term that has been replaced by words like announce or publish. Instead, treat "bulletin" strictly as a noun referring to a short official news report.
The word bulletin comes directly from the French term for a small ball or bullet. It entered English with its current meaning of a brief news report rather than retaining any literal connection to projectiles.