/ ɪmˈpruːvmənt; NAmE / noun
1.
[ U ] improvement (in / on / to sth) the act of making sth better; the process of sth becoming better :
Sales figures continue to show signs of improvement.
There is still room for improvement in your work.
We expect to see further improvement over the coming year.
2.
[ C ] improvement (in / on sth) a change in sth that makes it better; sth that is better than it was before :
a significant / substantial / dramatic improvement
a slight / steady improvement
an improvement in Anglo-German relations
This is a great improvement on your previous work.
improvements to the bus service
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WORD ORIGIN
late Middle English emprowement (in the sense profitable management or use; profit ), from Anglo-Norman French , from emprower (based on Old French prou profit, ultimately from Latin prodest is of advantage).