1. to mark (mail) with a postage stamp or official mark before sending, indicating that postage has been paid in advance
Usage: third-person singular present tense of 'prefrank'; postal/historical usage

1. plural of prefrank; envelopes or pieces of mail that have been marked in advance with postage payment
Usage: postal/historical usage; rare

Examples

• The postal service prefranks official documents to ensure timely delivery.
• She prefranks all her business correspondence at the beginning of the week.
• The office manager prefranks envelopes for the monthly billing cycle.
• Historical prefranks from the 19th century are now valuable to collectors.
• The government prefranks certain mailings to streamline the postal process.