Webster's Revised Unabridged Dictionary · 1913

Ameliorate

Ameliorate ({not transcribed}) , transitive verb

[Latin ad + meliorare to make better: compare French améliorer. See Meliorate.]

To make better; to improve; to meliorate.
In every human being there is a wish to ameliorate his own condition. — Macaulay

Ameliorate , intransitive verb

To grow better; to meliorate; as, wine ameliorates by age.