| Noun | 1. | Mailer - United States writer (born in 1923)author, writer - writes (books or stories or articles or the like) professionally (for pay) | |
| 2. | mailer - a person who mails something | |
| 3. | mailer - an advertisement that is sent by mail | |
| 4. | mailer - a container for something to be mailedcontainer - any object that can be used to hold things (especially a large metal boxlike object of standardized dimensions that can be loaded from one form of transport to another) | |