Improvement (noun)

1. The process of making something better.
2. A change or alteration made to something in order to make it better.

Origin:

Late middle english: from old french emprouvement, from emprouver "test, prove" (based on latin probare "prov.e")

Examples:

1. The company has seen a steady improvement in its profits.
2. The school has made improvements in its facilities.
3. The new software showed improvement in performance.
4. The company has implemented several improvements in their processes.
5. The team has made improvements to the product design.