A cousin is a relative who is the child of a parent's sibling; this is more specifically referred to as a first cousin. A parent of a first cousin is an aunt or uncle. More generally, in the kinship system used in the English-speaking world, cousins are in a type of relationship in which the two cousins are two or more generations away from their most recent common ancestor. In this usage, "degrees" and "removals" are used to specify the relationship more precisely.
https://en.wikipedia.org/wiki/Cousin