Definition of rm:
(n) :
(Mormonism) Initialism of returned missionary.
(n) :
Initialism of Resident Magistrate.
(n) :
(soccer) Initialism of Real Madrid.
(n) :
(British) Initialism of Royal Marines. [The amphibious force or marine corps of the United Kingdom.]
(n) :
(British) Initialism of Royal Mail.
(n) :
(typography) Initialism of right margin.