defragment - definition and synonyms

verb [transitive] computing 

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/ˌdiːfræɡˈment/
present tense
I/you/we/theydefragment
he/she/itdefragments
present participledefragmenting
past tensedefragmented
past participledefragmented
  1. to carry out an operation on a computer that puts all the files together and all the free space together, so that the computer operates faster