im‧prove‧ment W2
1 [uncountable and countable] the act of improving something or the state of being improved
improvement in/on/to
There's been a big improvement in the children's behaviour.
an improvement on earlier models
We need to carry out some improvements to the system.
dramatic/major/significant/substantial etc improvement
a marked improvement in her condition
It could be quite some time before we see any improvement.
This month's sales figures show some improvement.
Your English is much better, but there's still room for improvement (=it could be even better).
2 [countable] a change or addition that improves something:
Are you making some improvements to your home?

Dictionary results for "improvement"
Dictionary pictures of the day
Do you know what each of these is called?
What is the word for picture 1? What is the word for picture 2? What is the word for picture 3? What is the word for picture 4?
Click on any of the pictures above to find out what it is called.