What is the meaning of mastering?

noun

• Becoming proficient in the use of something; having mastery of.
  • usage: "his mastering the art of cooking took a long time"
• The act of making a master recording from which copies can be made.
  • usage: "he received a bill for mastering the concert and making 100 copies"

verb

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