also: たてよこひ
noun
Technical term used in imaging, video, and display contexts to describe the proportional relationship between width and height.
この動画の縦横比は16:9です。
The aspect ratio of this video is 16:9.
画像を拡大するときは縦横比を保ってください。
When enlarging the image, please maintain the aspect ratio.
Compound of 縦横 (vertical and horizontal) and 比 (ratio).