Amelioration, n.
Etymology: [Cf. F. amélioration.]
The act of ameliorating, or the state of being ameliorated; making or becoming better; improvement; melioration. "Amelioration of human affairs." J. S. Mill.
Shades of meaning
Fernald lists amelioration only as an antonym, under injury.
He lists it without comment; the entries above explain its neighbors.
Synonyms
none given