Skip to definition.
Get the FREE one-click dictionary software for Windows or the iPhone/iPad and Android apps

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 [informal]

Derived forms: defragmented, defragmenting, defragments

Encyclopedia: Defragment