master master /ˈmæstɝ/

adjective

1. Most important element  ( master , primary , chief , main , principal )
   most important element
    The chief aim of living
   the chief aim of living
    The main doors were of solid glass
   the main doors were of solid glass
    The principal rivers of America
   the principal rivers of America
    The principal example
   the principal example
    Policemen were primary targets
   policemen were primary targets
    The master bedroom
   the master bedroom
    A master switch
   a master switch
   

noun

1. () An artist of consummate skill  ( maestro , master )
   an artist of consummate skill
    A master of the violin
   a master of the violin
    One of the old masters
   one of the old masters
   
2. () A person who has general authority over others  ( overlord , lord , master )
   a person who has general authority over others
     The noble lord presided over his vast estate, ensuring prosperity for his subjects.
   The noble lord presided over his vast estate, ensuring prosperity for his subjects.
   
3. () An original creation (i.e., an audio recording) from which copies can be made  ( master copy , master , original )
   an original creation (i.e., an audio recording) from which copies can be made
   
4. () Presiding officer of a school  ( master , schoolmaster , headmaster )
   presiding officer of a school
    The headmaster addressed the students during the morning assembly.
   The headmaster addressed the students during the morning assembly.
   
   
5. () Directs the work of others  ( master )
   directs the work of others
   
6. () A combatant who is able to defeat rivals  ( superior , master , victor )
   a combatant who is able to defeat rivals
   
7. Key that secures entrance everywhere  ( master , master key , passe-partout , passkey )
   key that secures entrance everywhere
   
   
8. An authority qualified to teach apprentices  ( master , professional )
   an authority qualified to teach apprentices
   
9. Someone who holds a master's degree from academic institution  ( master )
   someone who holds a master's degree from academic institution
    He pursued his master's degree in business administration
   He pursued his master's degree in business administration
   
10. An officer who is licensed to command a merchant ship  ( master , sea captain , skipper , captain )
    an officer who is licensed to command a merchant ship
     The captain of the ship was experienced and knowledgeable about navigating the sea
    The captain of the ship was experienced and knowledgeable about navigating the sea
    
    

verb

1. () Be or become completely proficient or skilled in  ( get the hang , master )
   be or become completely proficient or skilled in
    She mastered Japanese in less than two years
   She mastered Japanese in less than two years
   
2. () Get on top of; deal with successfully  ( get over , subdue , master , overcome , surmount )
   get on top of; deal with successfully
    He overcame his shyness
   He overcame his shyness
   
3. () Have dominance or the power to defeat over  ( master , dominate )
   have dominance or the power to defeat over
    Her pain completely mastered her
   Her pain completely mastered her
    The methods can master the problems
   The methods can master the problems
   
4. Have a firm understanding or knowledge of; be on top of  ( control , master )
   have a firm understanding or knowledge of; be on top of
    Do you control these data?
   Do you control these data?