[mas-tuh-ree, mah-stuh-]
noun, plural masteries for 1-4.
command or grasp, as of a subject: a mastery of Italian.
superiority or victory: mastery over one's enemies.
the act of mastering.
expert skill or knowledge.
the state of being master; power of command or control.

1175–1225; master + -y3; replacing Middle English maistrie < Old French

nonmastery, noun, plural nonmasteries.
premastery, noun
remastery, noun, plural remasteries. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
mastery (ˈmɑːstərɪ)
n , pl -teries
1.  full command or understanding of a subject
2.  outstanding skill; expertise
3.  the power of command; control
4.  victory or superiority

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

early 13c., mesterie, "condition of being a master," also "superiority, victory;" from O.Fr. maistrie, from maistre (see master). Meaning "intellectual command" (of a topic, etc.) is from 1660s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Nor does this command of minute detail in any sense bar the way to an equal
  mastery of broad, general effects.
We have a mastery over our selves and our environments that is peculiar to our
It even has a chapter on the changes that occur in the brain during practice
  and mastery.
Once it no longer holds such a strong charge, having managed the problem will
  instill a sense of mastery.
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