To be a master.
To become the master of; to subject to one's will, control, or authority; to conquer; to overpower; to subdue.
To learn to a high degree of proficiency.
It took her years to master the art of needlecraft.
To own; to possess.
(especially of a musical performance) To make a master copy of.
(usually with in) To earn a Master's degree.
He mastered in English at the state college.
Becoming professional in the use of something; having mastery of.
The process by which an audio recording is mastered.