- 1[uncountable] the act of making something better; the process of something becoming better Sales figures continue to show signs of improvement. We expect to see further improvement over the coming year. improvement in/on/to something There is still room for improvement in your work.
- 2 [countable] a change in something that makes it better; something that is better than it was before a significant/substantial/dramatic improvement a slight/steady improvement improvement in/on/to something an improvement in Russo-American relations This is a great improvement on your previous work. improvements to the bus service
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