hm

1. hectometer; hectometers.

1. Hispanic male.

interjection

1. (used typically to express thoughtful absorption, hesitation, doubt, or perplexity.)

1. Her Majesty.
2. His Majesty.

symbol for

1. hectometre

the internet domain name for

1. Heard and McDonald Islands

abbreviation for

1. His (or Her) Majesty
2. heavy metal (sense 1)
3. headmaster; headmistress

interjection

1. used to indicate hesitation, doubt, assent, pleasure, etc