For 16:9 we have terms and definitions in 4 topics. The topics are Computer Technology, DTV, DVD and HDTV.

Aspect ratio (width vs height) most commonly known as widescreen or letterbox. It is wider than the standard 4:3 aspect ratio. 16:9 supporters state that the wider picture corresponds much better to the human visual field than the almost square 4:3. Other mention the fact that it matches the cinema screen format better. In Europe more and more broadcasts are done in 16:9.
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Aspect ratio of widescreen DTV formats for all HDTV and some SDTV (Standard Definition) video. "16" unit width corresponds to "9" unit height, proportionally, regardless of the actual size of the screen.

Aspect ratio most commonly known as widescreen and is wider than the standard 4:3 aspect ratio. 16:9 supporters state that the wider picture corresponds much better to the human visual field than the almost square 4:3.

See aspect ratio, and widescreen.
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