Definitions from Wiktionary ( )

▸ noun:  (chiefly UK, Ireland, Commonwealth) A box into which mail is put.
▸ noun:  A collection point for mail intended for onward delivery, a secure box or receptacle for this purpose.
▸ noun:  A delivery point for mail, a box, compartment or slot for this purpose.
▸ noun:  A hidden container that holds a logbook and rubber stamp, found by following clues as a form of recreation.
▸ noun:  (mountaineering) A rectangular hole or slot.
▸ adjective:  (film) Transferred to home video formats while preserving the original aspect ratio, having black bars above and below the picture area.
▸ verb:  (film, transitive) To transfer a widescreen motion picture to home video formats while preserving the original aspect ratio, with the placing of black bars above and below the picture area.
▸ verb:  (transitive, intransitive) To hunt for letterboxes (containers with logbook and rubber stamp) by following clues.




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