ATM (??t???m?)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).]atmabbr. Physics atmosphereAmerican Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.ATM abbreviation for 1. (Banking & Finance) automated teller machine 2. (Telecommunications) asynchronous transfer mode: used in digital communications, etc 3. (Telecommunications) text messaging at the moment Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014ATM automated-teller machine. [1980?85] atm. atmosphere. at. m. atomic mass. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.ATMAt the momentDictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited