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defunct
defuse
defy
deg.
dégagé
degas
degauss
degenderize
degeneracy
degenerate
degenerate matter
degenerate semiconductor
degeneration
degenerative
degenerative joint disease
deglamorize
deglaze
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defragment

de·frag·ment [ dee frágmənt ] (past and past participle de·frag·ment·ed, present participle de·frag·ment·ing, 3rd person present singular de·frag·ments)


transitive verb 
Definition:
 
reorganize storage space on hard disk: to reorganize the storage space on a hard disk and optimize its performance by consolidating related files

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