defragment Syllabification: (de·frag·ment)Pronunciation: /ˌdēfragˈment/Translate defragment | into Italian Definition of defragment verb [with object] Computing (of software) reduce the fragmentation of (a file) by concatenating parts stored in separate locations on a disk:the safe way to defragment your filesDerivatives defragmentationPronunciation: /dēˌfragmənˈtāSHən, -ˌmen-/ noun defragmenter noun defragment in other Oxford dictionaries Definition of defragment in the British & World English dictionary