Source : Webster's Revised Unabridged Dictionary (1913)

Six \Six\, a. [AS. six, seox, siex; akin to OFries. sex, D. zes,
   OS. & OHG. sehs, G. sechs, Icel., Sw., & Dan. sex, Goth.
   sa['i]hs, Lith. szeszi, Russ. sheste, Gael. & Ir. se, W.
   chwech, L. sex, Gr. ??, Per. shesh, Skr. shash. [root]304.
   Cf. {Hexagon}, {Hexameter}, {Samite}, {Senary}, {Sextant},
   {Sice}.]
   One more than five; twice three; as, six yards.

   {Six Nations} (Ethnol.), a confederation of North American
      Indians formed by the union of the Tuscaroras and the Five
      Nations.

   {Six points circle}. (Geom.) See {Nine points circle}, under
      {Nine}.

Source : WordNet®

Six Nations
     n : a league of Iroquois tribes including originally the Mohawk,
         Oneida, Onondaga, Cayuga and Seneca (the Five Nations);
         after 1722 they were joined by the Tuscarora (the Six
         Nations) [syn: {Iroquois League}, {League of Iroquois}, {Five
         Nations}]