cousin

Concise Oxford English Dictionary © 2008 Oxford University Press:
cousin/ˈkʌzn/

▶noun

• 1 (also first cousin) a child of one's uncle or aunt.

• 2 a person of a kindred people or nation.

• 3 historical a title formerly used by a sovereign in addressing another sovereign or a noble of their own country.

– phrases
first cousin once removed

• 1 a child of one's first cousin.

• 2 one's parent's first cousin.

first cousin twice removed

• 1 a grandchild of one's first cousin.

• 2 one's grandparent's first cousin.

second cousin a child of one's parent's first cousin.
second cousin once removed

• 1 a child of one's second cousin.

• 2 one's parent's second cousin.

third cousin a child of one's parent's second cousin.

– derivatives
cousinhood noun,
cousinly adjective,
cousinship noun.

– origin ME: from OFr. cosin, from L. consobrinus ‘mother's sister's child’, from con- ‘with’ + sobrinus ‘second cousin’ (from soror ‘sister’).