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NAmE//ˌmɑdəfəˈkeɪʃn//
[uncountable, countable] modification (of/to/in something)Check pronunciation: modification
Definition of modification noun from the Oxford Advanced American Dictionary
the act or process of changing something in order to improve it or make it more acceptable; a change that is made synonym adaptation Considerable modification of the existing system is needed. It might be necessary to make a few slight modifications to the design.