- a board or wall area on which bulletins, notices, or displays are put up
- a computer system accessible by modem, set up to allow users, esp. of microcomputers, to exchange messages, software, etc., usually in a particular field of interest
- A board on which notices are posted.
- Computers A system that enables users to send or read electronic messages, files, and other data that are of general interest and addressed to no particular person.
(plural bulletin boards)