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Verb: meliorate  'meel-yu,reyt or 'mee-lee-u,reyt [N. Amer], 'mee-lee-u,reyt [Brit]
  1. To make better
    "The editor meliorated the manuscript with his changes";
    - better, improve, amend, ameliorate, mend
  2. Get better
    "The weather meliorated toward evening";
    - better, improve, ameliorate

Derived forms: meliorated, meliorates, meliorating

Type of: alter, change, change state, modify, turn