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 master's degree.
A comparable official in medieval or modern institutions.
A judicial officer with limited authority to administer and enforce the law. A magistrate's court may have jurisdiction in civil or criminal cases, or both.
A high official of the state or a municipality in ancient Greece or Rome.