<p><strong>Noun</strong></p><ul><li>a placard or bill posted or intended for posting in a public place, as for advertising.</li><li>a large print of a painting, photograph, etc., used to decorate a wall: posters of street scenes.</li><li>a person who posts bills, placards, etc.</li><li>a person who posts or submits an online message to a message board: The previous poster in this thread was off-topic.</li></ul>