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: standard atmosphere 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: cash machine cash dispenser automated teller machine automatic teller machine automated teller automatic teller

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