There are 2 definitions of rm in English:

rm1

Syllabification: rm

abbreviation

Room.

Definition of rm in:

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Word of the day hypnopompic
Pronunciation: ˌhipnəˈpämpik
adjective
relating to the state immediately preceding waking up...

There are 2 definitions of rm in English:

RM2

Syllabification: RM

abbreviation

1(In the UK) Royal Mail.
1.1(In the UK) Royal Marines.

Definition of rm in: