aspect ratio

American  

[as-pekt rey-shoh, rey--shee-oh] / ˈæs pɛkt ˌreɪ ʃoʊ, ˌreɪ ˌʃi oʊ /

noun

1. Aeronautics. the ratio of the span of an airfoil to its mean chord.

2. Digital Technology, Television. the ratio of the width of an image to its height, usually a standard ratio such as 16 to 9 or 4 to 3.

3. Naval Architecture. the ratio of the height of a rudder to its fore-and-aft length.

4. Rocketry.

   1. Also called fineness ratio.  Also called slenderness ratio.  the ratio of the mean diameter of the body of a rocket or missile to its length.

   2. the ratio of the length of the combustion chamber of a rocket motor to its diameter.

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aspect ratio British  

noun

1. the ratio of width to height of the picture on a television or cinema screen

2. aeronautics the ratio of the span of a wing to its mean chord

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Etymology

Origin of aspect ratio

First recorded in 1905–10

Example Sentences

Despite this large size, the layer maintained a thickness of just 40 nanometers, giving it an extreme aspect ratio.

From Science Daily • Apr. 5, 2026

The cinematography by Adolpho Veloso, who also shot “The Jockey,” is particularly fine, working in a boxy 3:2 aspect ratio to capture the lush expanses of the land where Grainier lives and works.

From Los Angeles Times • Nov. 6, 2025

In aspect ratio phase trapping, defects, as well as the undesirable hexagonal phase, are "trapped" inside the grooves so that the surface of the active layer is a perfect cubic-phase material.

From Science Daily • Jan. 23, 2024

The UHD presentation, in a so welcomed screen-filling aspect ratio, brings to light a world saturated with color and lifelike textures as seen often by the element-controlled characters.

From Washington Times • Sep. 27, 2023

That means a better proportion of reaction to weight of surface, though the designer must not forget the drift of struts and wires necessary to brace up a surface of high aspect ratio.

From The Aeroplane Speaks Fifth Edition by Barber, H. (Horatio)