Automatic door
noun
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
Read Also:
- Automatic drive
automatic transmission. an automotive transmission requiring either very little or no manual shifting of gears. noun a transmission system in a motor vehicle, usually incorporating a fluid clutch, in which the gears change automatically
- Automatic exposure
noun the automatic adjustment of the lens aperture and shutter speed of a camera by a control mechanism Also called autoexposure
- Automatic focus
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
- Automatic frequency control
noun a system in a radio or television receiver by which the tuning of an incoming signal is accurately maintained AFC
- Automatic gain control
noun control of a radio receiver in which the gain varies inversely with the magnitude of the input, thus maintaining the output at an approximately constant level AGC