1. A delivery of mail. 2. The mail delivered. 3. A governmental system for transporting and delivering the mail. 4. A post office. 5. One of a series of relay stations along a fixed route, furnishing fresh riders and horses for the delivery of mail on horseback. 6. A rider on such a mail route; a courier. 7. To mail (a letter or package). 8. To send by mail in a system of relays on horseback. 9. Keep us posted. 10. To transfer (an item) to a ledger in bookkeeping. 11. To make the necessary entries in (a ledger). 12. To enter (a unit of information) on a record or into a section of storage. 13. To travel in stages or relays. 14. To travel with speed or in haste. 15. To bob up and down in the saddle in rhythm with a horse's trotting gait. 16. By mail. 17. With great speed; rapidly. 18. By post horse.
