[ dee-frag-muhnt, -ment ]

verb (used with object)Computers.
  1. to reorganize files on (a hard disk drive) so that the parts of each file are stored in contiguous sectors on the disk, thereby improving computer performance and maximizing disk space.

Origin of defragment

First recorded in 1980–85; de- + fragment

Other words from defragment

  • de·frag·men·ta·tion, noun
  • de·frag·ment·er, noun

Words Nearby defragment Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use defragment in a sentence

Scientific definitions for defragment


[ dĭ-frăgmənt ]

  1. 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.