say it: AY-tee-em
atm is a noun meaning "a unit of pressure: the pressure that will support a column of mercury 760 mm high at sea level and 0 degrees centigrade". It carries 3 recorded senses.
a unit of pressure: the pressure that will support a column of mercury 760 mm high at sea level and 0 degrees centigrade
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
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for atm come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.