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