WordWeb Online

1. A sign posted in a public place as an advertisement
   "a poster advertised the coming attractions";
   - posting, placard, notice, bill, card
    
2. Someone who pastes up bills or placards on walls or billboards
   - bill poster, bill sticker
    
3. Someone who sends a message to an internet discussion forum, blog, newsgroup, mailing list, etc.
    
4. [archaic] A horse kept at an inn or post house for use by mail carriers or for rent to travellers
   - post horse, post-horse

Derived forms: posters

Type of: Equus caballus, horse, sign, worker

Encyclopedia: Poster