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ascend +‎ -ancy or ascendant +‎ -cy


ascendancy (countable and uncountable, plural ascendancies)

  1. Supremacy; dominant control; the quality of being in the ascendant
    Synonym: superiority
    • 2011 January 15, Phil McNulty, “Tottenham 0 - 0 Man Utd”, in BBC[1]:
      Spurs ended the half in the ascendancy and Van der Vaart was again inches away from giving them the lead when he met Bale's cross but his header flew wide.
  2. (historical, Ireland) A class of Protestant landowners and professionals that dominated political and social life in Ireland up to the early 20th century
    • 1975, Terry Eagleton, New Left Review:
      [W. B. Yeats] belonged not to the ascendancy class but to the protestant bourgeoisie.
  3. (ecology) A quantitative attribute of an ecosystem, defined as a function of the ecosystem's trophic network, and intended to indicate its ability to prevail against disturbance by virtue of its combined organization and size.

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