D defs.my
Entry 1 sense Webster, 1913

Amelioration

/əm-ēlˌ-yẽr-āsh'-ən/ · A·mel·io·ra·tion · IPA /əˌmiːliəˈɹeɪʃən/
01 n. The act of ameliorating, or the state of being ameliorated; making or becoming better; improvement; melioration.
  1. 1.
    The act of ameliorating, or the state of being ameliorated; making or becoming better; improvement; melioration.