1. A software utility that reorganizes fragmented files on a computer disk to improve performance and access speed.
Usage: computing; also called defrag tool or defrag utility

Examples

• Running the defragmenter regularly helps keep your hard drive running smoothly.
• The defragmenter consolidated scattered file fragments into contiguous blocks.
• Modern operating systems include a built-in defragmenter for disk maintenance.
• After installing the new defragmenter, my computer's startup time improved noticeably.
• The defragmenter analyzed the disk and reported that fragmentation was at 15 percent.