Pronunciation: (mas'tur-ship", mä'stur-), [key]
1. the office, function, or authority of a master.
2. control; command: to have mastership over one's desires.
3. mastery, as of a subject.
4. expert skill or knowledge: He played with the mastership of a devoted musician.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.