From WordNet (r) 3.0 (2006) [wn]:
atm
n 1: a unit of pressure: the pressure that will support a column
of mercury 760 mm high at sea level and 0 degrees
centigrade [syn: standard atmosphere, atmosphere,
atm, 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"
[syn: asynchronous transfer mode, ATM]
3: an unattended machine (outside some banks) that dispenses
money when a personal coded card is used [syn: {cash
machine}, cash dispenser, automated teller machine,
automatic teller machine, automated teller, {automatic
teller}, ATM]
From The Free On-line Dictionary of Computing (8 July 2008) [foldoc]:
ATM
1. <communications> Asynchronous Transfer Mode.
2. Automatic Teller Machine - a cash dispenser.
3. <chat> At the moment.
4. <text> Adobe Type Manager.