There are 2 definitions of hm in English:

hm1

Line breaks: hm

abbreviation

Hectometre(s).

Definition of hm in:

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Word of the day neoteny
Pronunciation: nēˈätn-ē
noun
retention of juvenile features in the adult animal

There are 2 definitions of hm in English:

HM2

Line breaks: HM

abbreviation

1Headmaster or headmistress.
1.1British Heavy metal (music).
1.2(In the UK) Her or His Majesty('s): HM Forces

Definition of hm in: