ଅର୍ଥ : Becoming proficient in the use of something. Having mastery of.
ଉଦାହରଣ :
His mastering the art of cooking took a long time.
ଅର୍ଥ : The act of making a master recording from which copies can be made.
ଉଦାହରଣ :
He received a bill for mastering the concert and making 100 copies.