noun
1. becoming proficient in the use of something; having mastery of
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his mastering the art of cooking took a long time
• Derivationally related forms: ↑master
• Hypernyms: ↑education
2. the act of making a master recording from which copies can be made
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he received a bill for mastering the concert and making 100 copies
• Hypernyms: ↑recording, ↑transcription
Useful english dictionary. 2012.