ameliorate
Concise Oxford English Dictionary © 2008 Oxford University Press:
ameliorate /əˈmiːlɪəreɪt/
▶verb formal make (something bad or unsatisfactory) better.
– derivatives
amelioration noun,
ameliorative adjective,
ameliorator noun.
amelioration noun,
ameliorative adjective,
ameliorator noun.
'ameliorate' also found in these Oxford entries:

