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self-mas·tery | \ ˌself-ˈmas-t(ə-)rē 
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\Definition of self-mastery
: the ability to control one's own desires or impulses : self-control, self-discipline However, I realized the wisdom of Rooke's advice, and went away by myself to get over my anger and reacquire my self-mastery.— Bram Stoker Self-esteem that is not backed by self-mastery becomes narcissism.— Gracie Bonds Staples
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The first known use of self-mastery was in 1652
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