There are 2 definitions of hm in English:

hm

Syllabification: hm

abbreviation

Hectometer(s).

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Word of the day erroneous
Pronunciation: ɪˈrəʊnɪəs
adjective
wrong; incorrect

There are 2 definitions of hm in English:

HM

Syllabification: HM

abbreviation

1Headmaster or headmistress.
1.1(In the UK) Her (or His) Majesty('s): HM Forces

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