Automatic door

a self-opening door
Historical Examples

It was an automatic door, and resisted their every effort—until finally they were forced to tear it out with a ray.
The Black Star Passes John W Campbell

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  • Automatic exposure

    noun the automatic adjustment of the lens aperture and shutter speed of a camera by a control mechanism Also called autoexposure

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    noun a system in a camera which automatically adjusts the lens so that the object being photographed is in focus, often one using infrared light to estimate the distance of the object from the camera (as modifier): automatic-focus lens AF, Also called autofocus

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    noun a system in a radio or television receiver by which the tuning of an incoming signal is accurately maintained AFC

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