aspect ratio

Aeronautics. the ratio of the span of an airfoil to its mean chord.
Television. the ratio of the width of an image to its height, usually the ratio 4 to 3.
Naval Architecture. the ratio of the height of a rudder to its fore-and-aft length.
Also called fineness ratio, slenderness ratio. the ratio of the mean diameter of the body of a rocket or missile to its length.
the ratio of the length of the combustion chamber of a rocket motor to its diameter.

1905–10 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
aspect ratio
1.  the ratio of width to height of the picture on a television or cinema screen
2.  aeronautics the ratio of the span of a wing to its mean chord

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Computing Dictionary

aspect ratio definition

The ratio of width to height of a pixel, image, or display screen. Square pixels (1:1) are considered preferable but displays are usually about 5:4.
The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
But they are still susceptible to the prosaic deceptions of data displays such
  as scale, aspect ratio and placement.
It's features include the ability to adjust time between exposure, motor speed,
  aspect ratio and picture overlap.
The picture was crisper but the aspect ratio was poorly adjusted for the
  smaller screen.
The aspect ratio of a wing is defined as the square of the span divided by the
  wing area.
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