Longman Dictionary of Contemporary English homepage

defragment

 verb
     
Related topics: Computers
de‧frag‧ment also de‧frag informal [transitive]
TD to change the way in which the files on a computer's hard drive are stored and organized, by putting related information together so that the computer works more effectively:
It should start working faster after we defrag your disk.
—defrag noun [countable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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