Aspect-ratio meaning

The span-to-mean-chord ratio of an airfoil.
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The width-to-height ratio of an image or of the area used to display an image. Most widescreen televisions have an aspect ratio of 16:9.
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The ratio between any two dimensions, as width and height: it is used in describing airplane wings, movie film, etc.
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The aspect ratio states the comparison of width to height and is commonly used to describe the shape of a TV or computer screen. For example, the aspect ratio of an earlier standard-definition (SD) screen was 4:3, which is a relatively square rectangle. The 4:3 means "4 to 3," or four units wide to three units high. Today's TVs and monitors typically have a 16:9 ratio, which is a wide rectangle that is still not as wide as most movie theater (cinema) screens.Another way of expressing the 4:3 and 16:9 ratios is 1.33:1 and 1.78:1; however, these latter designations are used mostly for cinema formats, rather than TV (see illustration below). See letterbox, screen resolution, HDTV display modes and anamorphic DVD.
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The ratio of an object's longest dimension to its next-longest dimension.
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The ratio of width to height in a flat surface or 2-dimensional abstract construction, such as an image, character, or pixel. 4:3 (1.33:1) is the standard ratio for NTSC video. 1.85:1 and 2.35:1 are the most common aspect ratios for motion pictures.
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In video display, the relationship between the width and the height of the image. The NTSC standard, for example, specifies a 4:3 (4 wide to 3 high) aspect ratio. See also NTSC and video.
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Origin of aspect-ratio