noun
- Also letter box. Chiefly British. a public or private mailbox.
- Digital Technology, Television. a technique for displaying a wide-screen film or landscape video on a narrower screen by reducing its size but retaining the aspect ratio, with black bands filling the screen above and below the picture (often used attributively):letterbox videos.Compare pan and scan, pillarbox(def 1).
verb (used with object)
- Digital Technology, Television. to display (a film or video) by using the letterbox technique.
noun mainly British
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- a slot, usually covered with a hinged flap, through which letters, etc, are delivered to a building
- a private box into which letters, etc, are delivered
- Also called: postbox a public box into which letters, etc, are put for collection and delivery