letterbox

[let-er-boks]
a technique for displaying a wide-screen film on a regular-format television screen by reducing its size until the entire image is visible, thus retaining the aspect ratio, with black bands filling the borders of the screen above and below the picture. Compare pan and scan.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Once you choose a letterbox to find, touch the map to show where the box is
  located or to get directions to the box.
Peer through the letterbox, and in the gloom you see a calendar pinned to the
  wall.
But a bigger reason is that the focus of campaigning has moved from the street
  to the telephone and the letterbox.
For a letterbox cache, there is usually a logbook and rubber stamp.
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