noun.
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To become the master of; subject to one's will, control, or authority; conquer; overpower; subdue.
To make one's self master of; overcome the difficulties of; learn so as to be able to apply or use: as, to master a science.
To control as master or owner; possess; have power over.
To hold the position or relation of master to; be a master to.
In a technical use, to season or age.
To be skilful; excel.
noun.
A vessel with (a specified number of) masts: in composition: as, a three-master.
noun.
A man who has authority; a man who exercises the chief control over something or some one; a paramount ruler, governor, or director.
noun.
Specifically - A male teacher or instructor in a school, more especially the sole or head teacher; a schoolmaster.
noun.
The navigator of a ship. In the merchant marine the master is the captain or commander. In men-of-war the navigator or sailing-master formerly had the specific title of master, and was a line-officer of the lowest rank. In the British navy his title is now navigating-lieutenant or staff-commander. In the United States navy he is now ranked as lieutenant (junior grade), between eusign and lieutenant, and is called the navigator.
noun.
One who has another or others under his immediate control; a lord paramount or employer of slaves, vassals, domestic servants, workmen, or laborers, etc.; in law, specifically, one who has in his own right and by virtue of contract a legal personal authority over the services of another, such other being called his servant.
noun.
One charged with the care, direction, oversight, or control of some office, business, undertaking, or department: as, Master of the Rolls; a ship-, harbor-, or dock-master; master of the revels, ceremonies, etc.
noun.
One who has the power of controlling or using at pleasure; an owner or proprietor; a disposer.