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Verb: defragment  dee'frag-munt [N. Amer], ,dee-frag'ment [Brit]
  1. (computing) reduce fragmentation of a file (or all files) on a storage device by moving separated parts into a contiguous location
    "You should defragment your computer to solve your problem";
    - defrag

Derived forms: defragmenting, defragmented, defragments

Encyclopedia: Defragment