There are 2 definitions of mW in English:

mW1

Syllabification: mW

abbreviation

Milliwatt(s).

Definition of mW in:

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

There are 2 definitions of mW in English:

MW2

Syllabification: MW

abbreviation

Megawatt(s).

Definition of mW in: