Improvement
What it means
Meaning 1
A change or result that makes something better than it was.
Reach for it when identifying concrete progress that can be compared with an earlier state
The quieter motor is a meaningful improvement for staff working beside the lift.
Meaning 2
The gradual process of becoming more capable or healthy.
Reach for it when recognizing development that is still underway
His improvement in reading aloud became clear by the end of term.