Definition of "unlink"

unlink

verb
third-person singular simple present unlinks, present participle unlinking, simple past and past participle unlinked
1. (transitive) To decouple; to remove a link from, or separate the links of.
2. (transitive, computing, Unix) To delete (a file).
  Quotations
  That's because the permission to unlink a file doesn't depend upon the permission bits on the file itself; it's the permission bits on the directory that contains the file that matter.
  2001, Tom Phoenix, Randal L. Schwartz, Learning Perl, "O'Reilly Media, Inc.", page 175
noun
plural unlinks
1. (mathematics, knot theory) A link that is equivalent (under ambient isotopy) to finitely many disjoint circles in the plane.