Source : Webster's Revised Unabridged Dictionary (1913)

Cousin \Cous"in\ (k?z"'n), n. [F. cousin, LL. cosinus, cusinus,
   contr. from L. consobrinus the child of a mother's sister,
   cousin; con- + sobrinus a cousin by the mother's side, a form
   derived fr. soror (forsosor) sister. See {Sister}, and cf.
   {Cozen}, {Coz}.]
   1. One collaterally related more remotely than a brother or
      sister; especially, the son or daughter of an uncle or
      aunt.

   Note: The children of brothers and sisters are usually
         denominated first cousins, or cousins-german. In the
         second generation, they are called second cousins. See
         {Cater-cousin}, and {Quater-cousin}.

               Thou art, great lord, my father's sister's son, A
               cousin-german to great Priam's seed. --Shak.

   2. 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.

            My noble lords and cousins, all, good morrow.
                                                  --Shak.

Cousin \Cous"in\, n.
   Allied; akin. [Obs.] --Chaucer.

Source : WordNet®

cousin
     n : the child of your aunt or uncle [syn: {first cousin}, {cousin-german},
          {full cousin}]