betterment

nouns

a change for the better; progress in development
advance, betterment, improvement
is derived from
better
an improvement that adds to the value of a property or facility
betterment
is a type of (narrower)
a condition superior to an earlier condition
"the new school represents a great improvement"
improvement, melioration
the act of relieving ills and changing for the better
amelioration, betterment, melioration
is derived from
better