A first cousin.

plural of paternal cousin

plural of maternal cousin

plural of cousin-in-law

plural of cousin-in-law

The nephew or niece of someone's stepfather or stepmother. / The stepson or stepdaughter of someone's uncle or aunt. / The son or daughter of someone's stepuncle or stepaunt.

The son or daughter of one's half-uncle or half-aunt. A relative with one common grandparent.

plural of step-cousin

(obsolete, nautical, slang) an esteemed or preferred passenger aboard ship.

(anthropology) The child of one's father's sister or of one's mother's brother; a cousin related via opposite-gender siblings rather than same-gender ones (the latter being a parallel cousin).