1) Amelioration 2) Betterment 3) Improvement 1) Amelioration 2) Improvement 3) Reformation 4) Refurbishment 
• (n.) The act or operation of meliorating, or the state of being meliorated; improvement.
Mel`io·ra'tion noun [ Latin melioratio .] The act or operation of meliorating, or the state of being meliorated; improvement. Bacon. 
archaic or obsolete terms > General: An attempt to make better, soften or improve.
[n] - the linguistic process in which over a period of time a word grows more positive in connotation or more elevated in meaning
melioration 1. The act or process of improving something or the state of being improved; an improvement. 2. The linguistic process by which a word over a period of time grows more elevated in meaning or more positive in connotation. 3. A condition that is superior to an earlier condition or situation.
noun the linguistic process in which over a period of time a word grows more positive in connotation or more elevated in meaning