The aspect ratio for screens is basically it's dimensions (length and width) For example, an aspect ratio of 4:3 means it is 4 units long by three units wide.The aspect ratio of Standard Defenition...
The aspect ratio of a tire means The ratio of height to width. Reference, Automotive Steering, Suspension, and Alignment, Book Fifth edition Chapter 3. Page 60.
Strictly speaking, a TV receiver is the device that decodes a transmitted signal but it's safe to assume that the question refers to a television or monitor. Conventional televisions have an aspect...
Aspect ratio is the height and width of the picture or screen. Sometimes this is called FORMAT. Contrast is how much difference there is between the whitest and blackest part of the picture.