The Collaborative International Dictionary of English v.0.48:

Nation \Na"tion\, n. [F. nation, L. natio nation, race, orig., a
   being born, fr. natus, p. p. of nasci, to be born, for
   gnatus, gnasci, from the same root as E. kin. [root]44. See
   Kin kindred, and cf. Cognate, Natal, Native.]
   1. (Ethnol.) A part, or division, of the people of the earth,
      distinguished from the rest by common descent, language,
      or institutions; a race; a stock.
      [1913 Webster]

            All nations, and kindreds, and people, and tongues.
                                                  --Rev. vii. 9.
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   2. The body of inhabitants of a country, united under an
      independent government of their own.
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            A nation is the unity of a people.    --Coleridge.
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            Praise the power that hath made and preserved us a
            nation.                               --F. S. Key.
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   3. Family; lineage. [Obs.] --Chaucer.
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   4.
      (a) One of the divisions of university students in a
          classification according to nativity, formerly common
          in Europe.
      (b) (Scotch Universities) One of the four divisions (named
          from the parts of Scotland) in which students were
          classified according to their nativity.
          [1913 Webster]

   5. A great number; a great deal; -- by way of emphasis; as, a
      nation of herbs. --Sterne.
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   Five nations. See under Five.

   Law of nations. See International law, under
      International, and Law.
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   Syn: people; race. See People.
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The Collaborative International Dictionary of English v.0.48:

Five \Five\ (f[imac]v), a. [OE. fif, five, AS. f[imac]f,
   f[imac]fe; akin to D. vijf, OS. f[imac]f, OHG. finf, funf, G.
   f["u]nf, Icel. fimm, Sw. & Sw. Dan. fem, Goth. fimf, Lith.
   penki, W. pump, OIr. c['o]ic, L. quinque, Gr. pe`nte, [AE]ol.
   pe`mpe, Skr. pa[~n]can. [root]303. Cf. Fifth, Cinque,
   Pentagon, Punch the drink, Quinary.]
   Four and one added; one more than four.
   [1913 Webster]

   Five nations (Ethnol.), a confederacy of the Huron-Iroquois
      Indians, consisting of five tribes: Mohawks, Onondagas,
      Cayugas, Oneidas, and Senecas. They inhabited the region
      which is now the State of new York.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Five Nations
    n 1: 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, Six Nations]