There are 2 main definitions of hm in English:

hm1

Line breaks: hm

abbreviation

Definition of hm in:

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There are 2 main definitions of hm in English:

HM2

Line breaks: HM

abbreviation

1.1British Heavy metal (music).
1.2(In the UK) Her or His Majesty('s): HM Forces

Definition of hm in: