Noun

• S: (n) amelioration, melioration, betterment (the act of relieving ills and changing for the better)
• S: (n) improvement, melioration (a condition superior to an earlier condition) "the new school represents a great improvement"
• S: (n) melioration (the linguistic process in which over a period of time a word grows more positive in connotation or more elevated in meaning)