Masters

1. Someone who has control over something or someone.
2. The owner of an animal or slave.
3. The captain of a merchant ship; a master mariner.
4. The head of a household.
5. Someone who employs others.
6. An expert at something.

   Mark Twain was a master of fiction.

7. A tradesman who is qualified to teach apprentices.
8. A schoolmaster.
9. A skilled artist.
10. A man or a boy; mister. See Master.
11. A master's degree; a type of postgraduate degree, usually undertaken after a bachelor degree.

    She has a master in psychology.

12. A person holding such a degree.

    He is a master of marine biology.

13. The original of a document or of a recording.

    The band couldn't find the master, so they re-recorded their tracks.

14. The primary wide shot of a scene, into which the closeups will be edited later.
15. A parajudicial officer (such as a referee, an auditor, an examiner, or an assessor) specially appointed to help a court with its proceedings.

    The case was tried by a master, who concluded that the plaintiffs were the equitable owners of the property. [...]

16. A device that is controlling other devices or is an authoritative source.

    a master database

17. A person holding an office of authority, especially the presiding officer.
18. (by extension) A person holding a similar office in other civic societies.

1. To be a master.
2. To become the master of; to subject to one's will, control, or authority; to conquer; to overpower; to subdue.
3. To learn to a high degree of proficiency.

   It took her years to master the art of needlecraft.

4. To own; to possess.
5. (especially of a musical performance) To make a master copy of.
6. (usually with in) To earn a Master's degree.

   He mastered in English at the state college.

1. (in combination) A vessel having a specified number of masts.

   a two-master

noun

A master's degree.