Definition: Refers to the ratio of width to height; in animation, the term "aspect ratio" is most commonly used when discussing standards of sizes for screen productions, such as a 4:3 aspect ratio for web or television, or 16:9 for widescreen. (An example of a 4:3 ratio is a 320x240 Flash document.)
Aspect Ratio
By Adrien-Luc Sanders, About.com Guide
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