Related to Sixth cousin: Cousin once removedThird cousin twice removedThird cousin once removed. A child of one's aunt or uncle. Also called first cousin. A relative descended from a common ancestor, such as a grandparent, by two or more steps in a diverging line. A member of a kindred group or country: our Canadian cousins. Something similar in quality or character: "There's no mistaking soca for its distant Jamaican cousin, reggae" Michael Saunders. Used as a form of address by a sovereign in addressing another sovereign or a high-ranking member of the nobility. Also called: first cousincousin-german or full cousin the child of one's aunt or uncle. 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. Switch to new thesaurus. Mentioned in? References in periodicals archive? 