modification

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modification [noun] (CHANGE)

a change to something, usually to improve it

US /ˌmɑː.də.fəˈkeɪ.ʃən/ 
UK /ˌmɒd.ɪ.fɪˈkeɪ.ʃən/ 
Example: 

“No further modification is allowed to be made to the ultimate plan” the director announced.