extravagance - definition and synonyms

noun 

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/ɪkˈstrævəɡəns/
singularextravagance
pluralextravagances
  1. 1
    [uncountable] the practice of spending a lot of money, especially more than you should
    1. a.
      [countable] something that you spend a lot of money on, especially more than you should
  2. 2
    [uncountable] the extreme, unusual, or unreasonable quality of something