The ratio of the height to width or diameter of an item of process plant equipment such as a column or storage tank.
Computer
The ratio of width to height for a specified rectangular area such as a display surface or window.
Internet
In a graphic, the ratio of the horizontal size of a graphic and the vertical size.
Electronics and Electrical Engineering
1. The ratio of the width of a television picture to the height. Most countries, including the UK and US, have adopted an aspect ratio of 4:3. See alsoHDTV.
2. The ratio of the width to the length of the channel in field-effect transistors.