From The Collaborative International Dictionary of English v.0.48 [gcide]:
Ameliorate \A*mel"io*rate\, v. t. [imp. & p. p. Ameliorated;
p. pr. & vb. n. Ameliorating.] [L. ad + meliorare to make
better: cf. F. am['e]liorer. See Meliorate.]
To make better; to improve; to meliorate.
[1913 Webster]
In every human being there is a wish to ameliorate his
own condition. --Macaulay.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Ameliorate \A*mel"io*rate\, v. i.
To grow better; to meliorate; as, wine ameliorates by age.
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
ameliorate
v 1: to make better; "The editor improved the manuscript with
his changes" [syn: better, improve, amend,
ameliorate, meliorate] [ant: aggravate, exacerbate,
exasperate, worsen]
2: get better; "The weather improved toward evening" [syn:
better, improve, ameliorate, meliorate] [ant:
decline, worsen]