mastery

(mastər ē, mäs-)

noun pl. masteries

  1. mastership; rule; control
  2. ascendancy or victory in struggle or competition; the upper hand
  3. masterly ability; expert skill or knowledge: his mastery of chess
  4. the act of mastering (an art, science, etc.)

Origin: ME maistrie < OFr: see master

See mastery in American Heritage Dictionary 4

noun pl. mas·ter·ies
  1. Possession of consummate skill.
  2. The status of master or ruler; control: mastery of the seas.
  3. Full command of a subject of study: Her mastery of economic theory impressed the professors.

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