1. a container or envelope used for sending items through the mail
2. promotional material sent through the mail to advertise products or services
3. a person whose job is to send out mail or promotional materials

Examples

• She put the documents in a padded mailer before sending them.
• The company sent out thousands of mailers advertising their sale.
• I received a colorful mailer from the grocery store with weekly specials.
• The mailer was damaged during shipping, but the contents were safe.
• As the office mailer, he was responsible for all outgoing correspondence.
• The political candidate’s mailer arrived just before the election.
• We need to order more bubble mailers for fragile items.