excision

Short definition from Wiktionary

Noun

1. 1
   The removal of some text during editing.
2. 2
   The removal of something (a tumor or body part) by cutting.
3. 3
   The removal of a gene from a section of genetic material.
4. 4
   The fact that, under certain hypotheses, the homology of a space relative to a subspace is unchanged by the identification of a subspace of the latter to a point.