ATM 
(ā′tē′ĕm)
(ā′tē′ĕm)n.
An unattended electronic machine in a public place, connected to a data system and related equipment and activated by a bank customer to obtain cash withdrawals and other banking services.
[a(utomatic) t(eller) m(achine) or a(utomated) t(eller) m(achine).]