a unit of pressure: the pressure that will support a column of mercury 760 mm high at sea level and 0 degrees centigrade
"The scientist measured the atmospheric pressure in standard atm to calibrate the barometer."
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"
an unattended machine (outside some banks) that dispenses money when a personal coded card is used
"He quickly withdrew cash from the atm before the bank closed for the day."
Initialism of automated teller machine or initialism of automatic teller machine.
"I used my credit card at the atm to withdraw cash from the bank."
In plain English: An atm is a machine that lets you get cash from your bank account using your card and personal code.
"I forgot my wallet, so I went to the ATM on the corner to get some cash."
Initialism of at the moment.
"At that time, the project was on hold, but atm we are ready to launch it next week."
In plain English: Atm means at that moment, used to show something is happening right now.
"I waited at the ATM for five minutes before my card finally worked."
Initialism of at the moment.
"Atm, I can't make it to the meeting today because I have a sudden emergency."