Atm and Automatic teller machine

Atm noun - A unit of pressure: the pressure that will support a column of mercury 760 mm high at sea level and 0 degrees centigrade.

Automatic teller machine is a synonym for atm in automated teller machine topic. In some cases you can use "Automatic teller machine" instead a noun "Atm", when it comes to topics like cash dispenser.

Automatic teller machine noun - An unattended machine (outside some banks) that dispenses money when a personal coded card is used.

Atm is a synonym for automatic teller machine in automated teller machine topic. You can use "Atm" instead a noun phrase "Automatic teller machine", if it concerns topics such as cash dispenser.