master
noun(mas-ter)
a combatant who is able to defeat rivals
master
verb(mas-ter)
get on top of; deal with successfully
master
noun(mas-ter)
an authority qualified to teach apprentices
master
noun(mas-ter)
key that secures entrance everywhere
Synonyms: master key, passe-partout, 
passkey, 
 master
verb(mas-ter)
be or become completely proficient or skilled in
Synonyms: get the hang, 
Examples:
She mastered Japanese in less than two years. 
master
noun(mas-ter)
an original creation (i.e., an audio recording) from which copies can be made
master
noun(mas-ter)
presiding officer of a school
master
verb(mas-ter)
have dominance or the power to defeat over
Examples:
Her pain completely mastered her. 
The methods can master the problems. 
master
noun(mas-ter)
a person who has general authority over others
master
noun(mas-ter)
an officer who is licensed to command a merchant ship
master
noun(mas-ter)
an artist of consummate skill
Examples:
A master of the violin. 
One of the old masters. 
master
verb(mas-ter)
have a firm understanding or knowledge of; be on top of
master
adjective(mas-ter)
most important element
Examples:
The master bedroom. 
A master switch. 
master
noun(mas-ter)
directs the work of others
master
noun(mas-ter)
someone who holds a master's degree from academic institution