mas·ter·y

[mas-tuh-ree, mah-stuh-]
noun, plural mas·ter·ies for 1-4.
1.
command or grasp, as of a subject: a mastery of Italian.
2.
superiority or victory: mastery over one's enemies.
3.
the act of mastering.
4.
expert skill or knowledge.
5.
the state of being master; power of command or control.

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

non·mas·ter·y, noun, plural non·mas·ter·ies.
pre·mas·ter·y, noun
re·mas·ter·y, noun, plural re·mas·ter·ies.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To mastery
00:10
Mastery is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a fool or simpleton; ninny.
Collins
World English Dictionary
mastery (ˈmɑːstərɪ) [Click for IPA pronunciation guide]
 
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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Etymonline
Word Origin & History

mastery
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.
The road and the stream were battling for mastery, and the stream had the
  better of it.
Neither his grip upon his subject nor his technical mastery yet avail to make
  these felt otherwise than as digressions.
At no stage in the last three years have they demonstrate a mastery of events.
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