The possessor of a master's degree.
Master; sir: a title used in the Middle Ages, given to a person in authority, or to one having a licence from a university to teach philosophy and the liberal arts.
A headmaster in various educational institutions, e.g. a university.
A priest or bishop who is in charge of a parish or in an administrative leadership position in a theological seminary or academy.
In the Anglican Church, a cleric in charge of a parish and who owns the tithes of it.
In a Protestant church, a pastor in charge of a church with administrative and pastoral leadership combined.
An official in Scottish universities who heads the university court and is elected by and represents the student body.
In the Roman Catholic Church, a cleric with managerial as well as spiritual responsibility for a church or other institution.