improvement

The act of improving; advancement or growth; a bettering

The act of making profitable use or application of anything, or the state of being profitably employed; practical application, for example of a doctrine, principle, or theory, stated in a discourse.

The state of being improved; betterment; advance

Something which is improved

Increase; growth; progress; advance.

(in the plural) Valuable additions or betterments, for example buildings, clearings, drains, fences, etc., on premises.

(Patent Laws): A useful addition to, or modification of, a machine, manufacture, or composition.