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Definition: aliasing

(1) See alias.

(2) In computer graphics, aliasing is the stair-stepped appearance of diagonal lines when there are not enough pixels in the image or on screen to represent them realistically. Also called "stair-stepping" and "jaggies." See anti-aliasing.

Low and High Resolutions
A low-resolution image showing the stair-stepping is on the left. The higher-resolution version is on the right.