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Definition of defragment verb from the Oxford Advanced American Dictionary

defragment

verb
/ˌdiˈfræɡmɛnt/ defragment pronunciation American
(also informal defrag
/ˌdiˈfræɡ/ defrag pronunciation American
)
defragment something (computing)
 
to organize the files on a computer so that information relating to each file is stored in the same area, so the computer works faster