
Commonly, "cousin" refers to a "first cousin", people whose most recent common ancestor is a grandparent. A first cousin used to be known as a cousin-german, though this term is rarely used today. More generally, cousin is a type of familial relationship in which people with a known common ancestor are both two or more generations away from their most recent common ancestor. This distinguishes a cousin from an ancestor, descendant, sibling, aunt, uncle, niece, or nephew. Systems of "degrees" and "removals" are used in the English-speaking world to describe the exact relationship between two cousins (in the broad sense) and the ancestor they have in common.