There are 2 definitions of nm in English:

nm1

Syllabification: nm

abbreviation

1Nanometer.
1.1Nautical mile.

Definition of nm in:

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Word of the day antebellum
Pronunciation: ˌantēˈbeləm
adjective
occurring or existing before a particular war…

There are 2 definitions of nm in English:

NM2

Syllabification: NM

abbreviation

New Mexico (in official postal use).

Definition of nm in: