[1] : The Collaborative International Dictionary of English v.0.48

cousin \cous"in\ ku^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 for sosor 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.
      1913 webster

   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.
         1913 webster

               thou art, great lord, my father's sister's son,
               a cousin-german to great priam's seed. --shak.
         1913 webster

   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.
      1913 webster

            my noble lords and cousins, all, good morrow.
                                                  --shak.
      1913 webster
see also:
sister cozen coz first cousins cousins-german second cousins 
cater-cousin quater-cousin 

[2] : The Collaborative International Dictionary of English v.0.48

cousin \cous"in\, n.
   allied; akin. obs. --chaucer.
   1913 webster

[3] : WordNet (r) 2.0

cousin
     n : the child of your aunt or uncle syn: first cousin, cousin-german,
          full cousin
see also:
first cousin cousin-german full cousin 

[4] : Moby Thesaurus II by Grady Ward, 1.0

43 moby thesaurus words for "cousin":
   aunt, auntie, blood brother, brethren, brother, bub, bubba, bud,
   buddy, country cousin, cousin once removed, cousin twice removed,
   daughter, father, first cousin, foster brother, frater,
   grandnephew, grandniece, granduncle, great-aunt, great-uncle,
   half brother, kid brother, mother, nephew, niece, nuncle, nunks,
   nunky, second cousin, sis, sissy, sister, sister-german, sistern,
   son, stepbrother, stepsister, unc, uncle, uncs, uterine brother

[5] : Bouvier's Law Dictionary, Revised 6th Ed (1856)

cousin, domest. rel. cousins are kindred who are the issue of two brothers 
or two sisters, or of a brother and a sister. those who descend from the 
brother or sister of the father of the person spoken of are called paternal 
cousins; maternal cousins are those who are descended from the brothers or 
sisters of the mother. vide 2 bro. c. c. 125; 1 sim.  stu. 301; 3 russ. c. 
c. 140; 9 sim. r. 386, 457. 

Cousin >> C Words
Cousin, definition of term: Cousin
cousin_pag1.html

Second Cousin >> S Words
Second Cousin, definition of term: Second Cousin
second+cousin_pag1.html

First Cousin >> F Words
First Cousin, definition of term: First Cousin
first+cousin_pag1.html

Kissing Cousin >> K Words
Kissing Cousin, definition of term: Kissing Cousin
kissing+cousin_pag1.html