/euh meel'yeuh ray"sheuhn, euh mee"lee euh-/ , n.
1. an act or instance of ameliorating; the state of being ameliorated.
2. something that ameliorates; an improvement.
3. melioration (def. 1).
[ 1790-1800; AMELIORATE + -ION ]
Ant . depreciation, pejoration.