The ratio of height to width of a rectangle. Images with a wide aspect ratio are wider than they are tall. Images with a tall aspect ratio are taller than they are wide.
35mm film has an aspect ratio of 2:3. (24x36mm and sometimes called 1.5:1) Television usually has an aspect ratio of 4:3 (1.33:1) and some digital cameras use this aspect ratio as well. High definition television (HDTV) uses a ratio of 9:16 (1.78:1) , which is one of the aspect ratios supported by APS film.
No, your first answer was fine. Was just watching "It happened here" (great WWII film BTW if you've never seen it - Set in 1944 after succesful German invasion of Britain) and it said that on the box
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35mm film has an aspect ratio of 2:3. (24x36mm and sometimes called 1.5:1) Television usually has an aspect ratio of 4:3 (1.33:1) and some digital cameras use this aspect ratio as well. High definition television (HDTV) uses a ratio of 9:16 (1.78:1) , which is one of the aspect ratios supported by APS film.
HTH
On DVDs most of the older films are on 1.33:1, newer widescreen stuff is on 1.66:1