noun.
Becoming professional in the use of something; having mastery of
verb.
Present participle of master.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
becoming proficient in the use of something; having mastery of
noun.
the act of making a master recording from which copies can be made
Word Usage
"Letter to M.B. *** Oh for that simple faith which thou speaks of as mastering mountains of difficulty, and that not by might or power, but by its intrinsically victorious nature!"