definition of
melioration

[1] #1 melioration n. [amelioration, betterment] the act of relieving ills and changing for the better. wn

[2] #2 melioration n. [improvement] a condition superior to an earlier condition; "the new school represents a great improvement". wn

[3] #3 melioration n. the linguistic process in which over a period of time a word grows more positive in connotation or more elevated in meaning. wn