Found in the following dictionaries
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
OTCWL2014 (NASPA Word List 2014)
"Defragment" Definition
verb-transitive
To reorganize (a computer file) to eliminate fragmentation.
Source: American Heritage Dictionary
verb
To run a process that collects fragments of files and sorts them into contiguous sections on one or more hard disks or hard disk partitions, thus speeding up file management.
Source: Wiktionary
To reorganize separated fragments of related data on (a computer disk) into a contiguous arrangement.
Source: Merriam-Webster
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