me·lio·ra·tion
ˌmēlyəˈrāshən
-lēə-
plural -s
: the quality or state of being meliorated or an act of meliorating : betterment: such as
a
: lasting or major improvement of land (as by a tenant)
the effect of meliorations was greater on height growth of fir and on soil flora and condition—
Biological Abstracts
b
: the historical process by which the semantic and connotative status of a word tends to rise
the emergence of steward from sty-ward is an example of melioration in action
compare pejoration
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Merriam-Webster unabridged



