WordReference Random House Unabridged Dictionary of American English © 2017
mel•io•rate  (mēlyə rāt′, mēlē ə-),USA pronunciation v.t., v.i.,  -rat•ed, -rat•ing. 
  1. ameliorate.
mel•io•ra•ble  (mēlyər ə bəl, mēlē ər ə-),USA pronunciation adj.  mel•io•ra•tive  (mēlyə rā′tiv, -yər ə tiv, mēlē ə rā′-, -ər ə-),USA pronunciation adj.  melio•ra′tor, n. 
  • Latin meliōrātus (past participle of meliōrāre) to make better, improve, equivalent. to meliōr- (stem of melior) better + -ātus -ate1
  • 1545–55;

'meliorative' also found in these entries:
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