Aspect ratio
In general, a term for how the image appears on the screen based on how it was shot, refers to the ratio of width (horizontal or top) to height (vertical or side) of a film frame, image or screen, the most common or standard aspect ratio in early films to the 1950s was called academy aperture (or ratio), at a ratio of 1.33:1 (The same as 4:3 on a tv screen), normal 35mm films are shot at a ratio of 1.85:1, Newwidescreen formats and aspect ratios were introduced in the 1950s, from 1.65:1 And higher, cinemascope (a trade name for a widescreen movie format used in the us from 1953 to 1967) and other anamorphic systems (such as panavision) have a 2.35:1 Ar, while 70mm formats have an ar of 2.2:1,Cinerama had a 2.77:1 Aspect ratio, letterboxed videos for widescreen tv's are frequently in 16:9 (or 1.77:1) Ar.
Source: http://www.elginisd.net/cms/lib6/TX01917830/Centricity/Domain/560/Film%20Terms%20Glossary.pdf
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