Synonyms of mastery in English:

mastery

noun

  • 1 her mastery of the language
    proficiency, ability, capability; knowledge, understanding, comprehension, familiarity, command, grasp, grip
  • 3 man's mastery over nature
    control, domination, command, ascendancy, supremacy, preeminence, superiority; triumph, victory, the upper hand, the whip hand, rule, government, power, sway, authority, jurisdiction, dominion, sovereignty
  • Definition of mastery in:

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    Word of the day hypnopompic
    Pronunciation: ˌhɪpnə(ʊ)ˈpɒmpɪk
    adjective
    relating to the state immediately preceding waking up