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[let-er-boks] /ˈlɛt ərˌbɒks/
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.
Origin of letterbox
1765-75; letter1 + box1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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British Dictionary definitions for letterboxing


a method of formatting film that enables all of a wide-screen film to be transmitted on a television screen, resulting in a blank strip of screen above and below the picture
a type of treasure hunt in which a box, known as a letterbox, is hidden in a remote rural location and clues are provided as to its whereabouts
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Slang definitions & phrases for letterboxing



To show a wide-screen movie on the television screen by reducing its size and putting black bars above and below: Today we'll see a wide-format, letterboxed edition, which is rarely telecast/ ''letterboxing,'' which retains theatrical images on a rectangular shape (1990s+ Television)

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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