[dee-frag-muh nt, -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.
Related formsde·frag·men·ta·tion, nounde·frag·ment·er, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Word Origin and History for defragment

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

Online Etymology Dictionary, © 2010 Douglas Harper

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.