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improvement  (improvements plural )
1  n-var If there is an improvement in something, it becomes better. If you make  improvements to  something, you make it better. 
...the dramatic improvements in organ transplantation in recent years...  
2  n-count If you say that something is  an improvement on a previous thing or situation, you mean that it is better than that thing. 
The new Prime Minister is an improvement on his predecessor...