There are 2 main definitions of atm in English:

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atm1

Syllabification: atm

abbreviation

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

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There are 2 main definitions of atm in English:

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ATM2

Syllabification: ATM

abbreviation

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

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