as·cen·den·cy /əˈsɛndən(t)si/
  優勢,優越,權勢
  As·cend·en·cy n. Governing or controlling influence; the state that exists when one person or group has power over another; domination; power.
     An undisputed ascendency.   --Macaulay.
     Custom has an ascendency over the understanding.   --Watts.
  Syn: -- Control; authority; influence; sway; dominion; prevalence; domination; dominance; ascendance; ascendence.
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  ascendency
       n : the state that exists when one person or group has power
           over another; "her apparent dominance of her husband was
           really her attempt to make him pay attention to her"
           [syn: dominance, ascendance, ascendence, ascendancy,
            control]