There are 2 definitions of lm in English:

lm1

Syllabification: lm

abbreviation

Lumen(s).

Definition of lm in:

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Word of the day flippant
Pronunciation: ˈflipənt
adjective
not showing a serious or respectful attitude

There are 2 definitions of lm in English:

LM2

Syllabification: LM

abbreviation

1Long meter.
1.1Lunar module.

Definition of lm in: