Webster's Revised Unabridged Dictionary · 1913

Meliorate

Meliorate (mēl"yo*rāt) , transitive verb

[Latin melioratus, past participle of meliorare to meliorate, from melior better; akin to Greek ma^llon rather, ma`la very. Compare Ameliorate.]

To make better; to improve; to ameliorate; to soften; to make more tolerable.
Nature by art we nobly meliorate. — Denham
The pure and benign light of revelation has had a meliorating influence on mankind. — Washington

Meliorate , intransitive verb

To grow better.