noun (n)

• a unit of pressure: the pressure that will support a column of mercury 760 mm high at sea level and 0 degrees centigrade(noun.quantity)

  Synonym:
  atmosphere, standard atmosphere, standard pressure
  

  source: wordnet30
• 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(noun.communication)

  Example:
  ATM is used for both LAN and WAN.
  

  Synonym:
  asynchronous transfer mode
  

  source: wordnet30
• an unattended machine (outside some banks) that dispenses money when a personal coded card is used(noun.artifact)

  Synonym:
  automated teller, automated teller machine, automatic teller, automatic teller machine, cash dispenser, cash machine
  

  source: wordnet30