Etymology
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ATM (n.)

1976, acronym for automated teller machine (1974), which was developed in modern form c. 1968. See teller.

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Definitions of ATM

atm (n.)
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
atm (n.)
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;
Synonyms: asynchronous transfer mode
atm (n.)
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
From wordnet.princeton.edu