マスター

Etymology
Borrowed from. .

Noun

 * 1) a manager; a barkeeper, a landlord (of a pub); a storekeeper, shopkeeper; an owner
 * 2) a master a person with a master's degree
 * 3) a master's degree
 * 4) a master a person in charge; a skilled person
 * 5) a master owner of an animal, slave, or maid or butler

Verb

 * 1) to master to acquire complete knowledge or skill (in something)