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[dee-frag-muh nt, -ment] /diˈfræg mənt, -mɛnt/ 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.
Related forms
defragmentation, noun
defragmenter, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Contemporary definitions for defragment
intransitive verb

to carry out or undergo defragmentation; also called defrag

Word Origin


Usage Note

defragmenting, n; defragmentation, n; defragmenter, n's 21st Century Lexicon
Copyright © 2003-2014, LLC
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Word Origin and History for defragment

1992, in computer sense, from de- + fragment. Related: Defragmented; defragmenting.

Online Etymology Dictionary, © 2010 Douglas Harper
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defragment in Science
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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defragment in Technology

tool, file system
/dee-frag(-ment)'/ (Or "defrag") To coalesce files and free space on a file system; to reduce fragmentation.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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