melioration
1. [ noun ] the act of relieving ills and changing for the better
Synonyms: betterment amelioration
Related terms: improvement better better
2. [ noun ] a condition superior to an earlier condition
Synonyms: improvement
Examples:

: "the new school represents a great improvement"

Related terms: decline condition development reformation renovation betterment better
3. [ noun ] (linguistics) the linguistic process in which over a period of time a word grows more positive in connotation or more elevated in meaning
Related terms: drift better
Similar spelling:   meliorative
  meliorate