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1. One that has control over another person, a group of persons, or a thing, especially:
a. The owner or keeper of an animal: The dog ran toward its master.
b. The owner of a slave.
c. One who has control over or ownership of something: the master of a large tea plantation.
d. An employer.
e. The man who serves as the head of a household.
f. One who defeats another; a victor: I had to admit that I had met my master and so conceded the game.
g. One who acts out the role of the dominating partner in a sadomasochistic relationship.
2. The captain of a merchant ship. Also called master mariner.
a. One whose teachings or doctrines are accepted by followers.
b. Master Christianity Jesus.
4. A male teacher, schoolmaster, or tutor.
5. One who holds a master's degree.
a. An artist or performer of great and exemplary skill.
b. An old master.
7. A worker qualified to teach apprentices and carry on the craft independently.
8. An expert: a master of three languages.
9. Abbr. M.
a. Used formerly as a title for a man holding a naval office ranking next below a lieutenant on a warship.
b. Used as a title for a man who serves as the head or presiding officer of certain societies, clubs, orders, or institutions.
c. Master Used as a title for any of various male officers having specified duties concerning the management of the British royal household.
d. Master Used as a courtesy title before the given or full name of a boy not considered old enough to be addressed as Mister.
e. Archaic Used as a form of address for a man; mister.
10. One who is appointed to assist a court in the performance of certain legal functions, such as the taking of testimony and calculating damages in complex litigation. Also called special master.
11. Master A man who owns a pack of hounds or is the chief officer of a hunt.
12. An original, such as an original document or audio recording, from which copies can be made.
1. Of, relating to, or characteristic of a master.
2. Principal or predominant: a master plot.
3. Controlling all other parts of a mechanism: a master switch.
4. Highly skilled or proficient: a master thief.
5. Being an original from which copies are made.
tr.v. mas·tered, mas·ter·ing, mas·ters
1. To become very skilled in or knowledgeable about: mastered the language in a year's study.
2. To overcome or defeat: He finally mastered his addiction to drugs.
3. To produce a master copy of (an audio or video recording, for example).

[Middle English maister, master, from Old English māgister, mægister and Old French maistre, both from Latin magister; see meg- in Indo-European roots.]

mas′ter·dom n.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.mastered - understood perfectlymastered - understood perfectly; "had his algebra problems down"
perfect - being complete of its kind and without defect or blemish; "a perfect circle"; "a perfect reproduction"; "perfect happiness"; "perfect manners"; "a perfect specimen"; "a perfect day"
References in classic literature ?
Amy got no farther, for Jo's hot temper mastered her, and she shook Amy till her teeth chattered in her head, crying in a passion of grief and anger.
She attempted to rise; she could not have done so without betraying the agitation which mastered her at sight of him, so she fell back upon the stool, only exclaiming, "Why, Robert
His blood curdled when he found himself in absolute contact with such fierce and implacable enemies; but he so far mastered his feelings as to pursue his way into the center of the lodge, with an exterior that did not betray the weakness.
You think you have mastered it, but just as you get well underway in following, it turns a back-somersault and there you are.