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Adjective: ameliorative  u'mee-lee-u-ru-tiv or u'meel-yu,rey-tiv [N. Amer], u'mee-lee-u-ru-tiv [Brit]
  1. Tending to ameliorate
    "Federal assistance has an ameliorative effect on the difference in school budgets between wealthy and poor districts";
    - ameliorating, amelioratory, meliorative

See also: bettering

Encyclopedia: Ameliorative