Origin: Greek prefix auto-
Autofocus has 3 different meanings across 1 category:
an optical device for focussing a camera or other instrument automatically
"The photographer switched to his new lens because it had better autofocus than the old one."
A feature of some cameras and other optical systems that allows a correct focus on the subject to be obtained automatically
"The camera's autofocus locked onto my cat instantly, blurring the background while keeping her eyes perfectly sharp."
To focus automatically.
"The new camera has an autofocus feature that instantly sharpens your subject without you needing to adjust the lens manually."