The removal of something (a tumor or body part) by cutting.
The removal of some text during editing.
The removal of a gene from a section of genetic material.
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.
A procedure in which one or more incisions are made into the body in order to repair damage or remove diseased tissue; an operation.