cousin

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A child of one's aunt or uncle. Also called first cousin.
2. n. A relative descended from a common ancestor, such as a grandparent, by two or more steps in a diverging line.
3. n. A relative by blood or marriage; a kinsman or kinswoman.
4. n. A member of a kindred group or country: our Canadian cousins.
5. n. Something similar in quality or character: "There's no mistaking soca for its distant Jamaican cousin, reggae” ( Michael Saunders).
6. n. Used as a form of address by a sovereign in addressing another sovereign or a high-ranking member of the nobility.

Century Dictionary and Cyclopedia

1. n. In general, one collaterally related by blood more remotely than a brother or sister; a relative; a kinsman or kinswoman; hence, a term of address used by a king to a nobleman, particularly to one who is a member of the council, or to a fellow-sovereign. In English royal writs and commissions it is applied to any peer of the degree of an earl—a practice dating from the time of Henry IV., who was related or allied to every earl in the kingdom.
2. n. Specifically, in modern usage The son or daughter of an uncle or an aunt, or one related by descent in a diverging line from a known common ancestor. The children of brothers and sisters are called cousins, cousins german, first cousins, or full cousins; children of first cousins are called second cousins, etc. Often, however, the term second cousin is loosely applied to the son or daughter of a cousin german, more properly called a first cousin once removed.
3. Allied; kindred.
4. To call “cousin”; claim kindred with. See cousin, n.
5. An obsolete spelling of cozen.

Wiktionary

1. n. The son or daughter of a person’s uncle or aunt; a first cousin.
2. n. Any relation who is not a direct ancestor or descendant; one more distantly related than an uncle, aunt, granduncle, grandaunt, nephew, niece, grandnephew, grandniece, etc.

GNU Webster's 1913

1. n. One collaterally related more remotely than a brother or sister; especially, the son or daughter of an uncle or aunt.
2. n. A title formerly given by a king to a nobleman, particularly to those of the council. In English writs, etc., issued by the crown, it signifies any earl.
3. n. obsolete Allied; akin.

WordNet 3.0

1. n. the child of your aunt or uncle