Webster's Revised Unabridged Dictionary · 1913

Mastership

Mastership , noun

1.
The state or office of a master.
2.
Mastery; dominion; superior skill; superiority.
Where noble youths for mastership should strive. — Driden
3.
Chief work; masterpiece. [Obsolete] — Dryden
4.
An ironical title of respect.
How now, seignior Launce! what news with your mastership? — Shakespeare