- Open and sincere in expression; straightforward: made several frank remarks about the quality of their work.
- Clearly manifest; evident: frank enjoyment.
- To put an official mark on (a piece of mail) so that it can be sent free of charge.
- To send (mail) free of charge.
- To place a stamp or mark on (a piece of mail) to show the payment of postage.
- To enable (a person) to come and go freely.
- A mark or signature placed on a piece of mail to indicate the right to send it free of charge.
- The right to send mail free.
- A franked piece of mail.
- Informal A frankfurter.