A small quantity removed or lost. One of a series of regular subtractions.
To decrease a value by a basic quantity unit.
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.
The removal of some text during editing.
The removal of a gene from a section of genetic material.
The removal of something (a tumor or body part) by cutting.