B1
progress in becoming better, or when something has been made better
Dictionary examples:
My time management showed improvement: I was only 30 minutes late, not an hour! (0.0)
The improvement in my spelling was clear: I only made five mistakes, not fifteen! (0.0)
My drawing showed improvement: people could now guess what I was trying to draw. (0.0)
He is still recovering, but the doctors say he has shown some improvement. (30.1)
We are seeing significant improvements in test scores. (31.1)