modification
US /ˌmɑː.də.fəˈkeɪ.ʃən/
UK /ˌmɑː.də.fəˈkeɪ.ʃən/

1.
the action of modifying something
:
•
The architect proposed a modification to the building's design.
•
Any modification to the software requires approval.
2.
a change made to something
:
•
The car underwent several modifications to improve its performance.
•
These modifications make the device more user-friendly.