Definition of "letter-box" []

• A box to receive letters. (noun)
• One of a number of rented boxes in a post-office, in which letters are placed by the postmaster or clerk to be collected by the owners of the boxes at their convenience. More commonly called simply box. (noun)
• A box to receive letters, affixed at the entrance of a dwelling or place of business, usually upon the inside of the door, with a slit through which letters may be thrust in from without. (noun)

The Century Dictionary (Public Domain)

• "We have our local paper delivered, propped nicely in our letter-box."
• "I waited till the door was shut on me, and slipped the tract into the letter-box."
• "He folded the stamps in with his manuscript, dropped it into the letter-box, and from three weeks to a month afterward the postman came up the steps and handed him the manuscript."