mastering

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
Definition of mastering: 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"*