atm meaning and definition

ATM noun

Definition of atm (noun)

1. a unit of pressure: the pressure that will support a column of mercury 760 mm high at sea level and 0 degrees centigrade
   • synonyms: atmosphere, standard atmosphere, standard pressure
2. a means of digital communications that is capable of very high speeds; suitable for transmission of images or voice or video as well as data
   • "ATM is used for both LAN and WAN"
   • synonyms: asynchronous transfer mode
3. an unattended machine (outside some banks) that dispenses money when a personal coded card is used
   • synonyms: automated teller, automated teller machine, automatic teller, automatic teller machine, cash dispenser, cash machine