Meaning of MASTERING in English

MASTERING

n. becoming an expert in using something; having proficiency or mastery of; act of making a master recording from which all copies are made, process in which recorded material is taken from a "master tape" and made ready for duplication in the format of a final product to be released to the media

Explanatory English dictionary bed edition.      Толковый словарь английского языка Редакция bed.