de-fragmentation

defragment

[dee-frag-muhnt, -ment] Computers.
verb (used with object)
to reorganize files on (a disk) so that the parts of each file are stored in contiguous sectors on the disk, thereby improving computer performance and maximizing disk space.
Also, Informal, defrag.

defragmentation, noun
defragmenter, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Etymonline
Word Origin & History

defragment
1992, in computer sense, from de- + fragment.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
defragment   (dĭ-frāg'mənt)  Pronunciation Key 
To reorganize the way information is stored on a computer disk so that all of the information belonging to a file is stored in a single, contiguous area the disk.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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