[ mas-tuh-ree, mah-stuh- ]
/ ˈmæs tə ri, ˈmɑ stə- /

noun, plural mas·ter·ies 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.

Origin of mastery

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


non·mas·ter·y, noun, plural non·mas·ter·ies.pre·mas·ter·y, nounre·mas·ter·y, noun, plural re·mas·ter·ies. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Examples from the Web for mastery

British Dictionary definitions for mastery

/ (ˈmɑːstərɪ) /

noun plural -teries

full command or understanding of a subject
outstanding skill; expertise
the power of command; control
victory or superiority
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012