Headmaster
Definition 1 of 1
Pro Tip 1/3
UK Specific
The term is mostly used in the UK, in other places, like the US, 'principal' is more common. My cousin in the UK mentioned their headmaster, but our school in the US has a principal.
Pro Tip 2/3
Gendered Title
'Headmaster' is gender-specific to males, and 'headmistress' is the female counterpart. Mrs. Brown is the headmistress at our sister school.
Pro Tip 3/3
Authority
The headmaster is the highest authority in a school and manages all school affairs. The headmaster initiated changes to the school uniform policy.