There are 2 definitions of atm in English:

atm1

Syllabification: atm

abbreviation

Physics
Atmosphere(s), as a unit of pressure.

Definition of atm in:

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Word of the day animalcule
Pronunciation: ˌanɪˈmalkjuːl
noun
a microscopic animal

There are 2 definitions of atm in English:

ATM2

Syllabification: ATM

abbreviation

1 Telecommunications Asynchronous transfer mode.
1.1Automated (or automatic) teller machine.

Definition of atm in: