im·prove·ment 
/ɪmˈpru:vmənt/ noun
plural im·prove·ments /ɪmˈpru:vmənt/ noun 1 [noncount] : the act of improving something : the act or process of making something better
▪ Doctors were amazed by the sudden improvement in her medical condition. ▪ His cooking needs improvement. = There's still room for improvement in his cooking. 2 [count] a : the quality of being better than before
▪ I've noticed a significant improvement in your work since the spring.
b : an addition or change that makes something better or more valuable
▪ The editor made some improvements to/in the article before it was printed. ▪ They spent the money on new kitchen cabinets and other home improvements. ◊An improvement on or (chiefly US) over something is a better version of it or a better way of doing it.
▪ The food isn't fancy, but it's certainly an improvement over what we're served at school.
▪ Doctors were amazed by the sudden improvement in her medical condition. ▪ His cooking needs improvement. = There's still room for improvement in his cooking.
▪ I've noticed a significant improvement in your work since the spring.
b : an addition or change that makes something better or more valuable
▪ The editor made some improvements to/in the article before it was printed. ▪ They spent the money on new kitchen cabinets and other home improvements. ◊An improvement on or (chiefly US) over something is a better version of it or a better way of doing it.
▪ The food isn't fancy, but it's certainly an improvement over what we're served at school.
