Definition of "defragment"

defragment

/diːfɹæɡˈmɛnt/

verb
third-person singular simple present defragments, present participle defragmenting, simple past and past participle defragmented
1. (computing) To run a process that collects fragments of files and sorts them into contiguous sections on one or more hard disks or hard disk partitions, thus speeding up file management.
  Quotations
  SSDs don't need defragmenting. Windows wont' even let you try to defragment an SSD. However, if you could defragment an SSD, you might shorten the device's lifespan.
  2013, Dan Gookin, PCs For Dummies‎, John Wiley & Sons