first cousin, cousin-german, Also called: full cousin the child of one's aunt or uncle
2.
a relative who has descended from one of one's common ancestors. A person's second cousin is the child of one of his parents' first cousins. A person's third cousin is the child of one of his parents' second cousins. A first cousin once removed (or loosely second cousin) is the child of one's first cousin
3.
a member of a group related by race, ancestry, interests, etc: our Australian cousins
4.
a title used by a sovereign when addressing another sovereign or a nobleman
[C13: from Old French cosin, from Latin consōbrīnus cousin, from sōbrīnus cousin on the mother's side; related to soror sister]