"mastering" in the noun sense
becoming proficient in the use of something having mastery of
"his mastering the art of cooking took a long time"
the act of making a master recording from which copies can be made
"he received a bill for mastering the concert and making 100 copies"
"mastering" in the verb sense
1. master, get the hang
be or become completely proficient or skilled in
"She mastered Japanese in less than two years"
2. overcome, get over, subdue, surmount, master
get on top of deal with successfully
"He overcame his shyness"
3. dominate, master
have dominance or the power to defeat over
"Her pain completely mastered her"
"The methods can master the problems"
4. master, control
have a firm understanding or knowledge of be on top of
"Do you control these data?"
Source: WordNet® (An amazing lexical database of English)
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