A person who shares a parent; one's brother or sister who one shares a parent with.
A node in a data structure that shares its parent with another node.
The most closely related species, or one of several most closely related species when none can be determined to be more closely related.
The relation of sharing properties.
A transformation that preserves angles and the ratios of distances
The property of two matrices being similar.
Closeness of appearance to something else.