The Collaborative International Dictionary of English v.0.48:

British \Brit"ish\, n. pl.
   People of Great Britain.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

British \Brit"ish\ (br[i^]t"[i^]sh), a. [AS. Brittisc,
   Bryttisc.]
   Of or pertaining to Great Britain or to its inhabitants; --
   sometimes restricted to the original inhabitants.
   [1913 Webster]

   British gum, a brownish substance, very soluble in cold
      water, formed by heating dry starch at a temperature of
      about 600[deg] Fahr. It corresponds, in its properties, to
      dextrin, and is used, in solution, as a substitute for gum
      in stiffering goods.

   British lion, the national emblem of Great Britain.

   British seas, the four seas which surround Great Britain.
      [1913 Webster]

WordNet (r) 3.0 (2006):

British
    adj 1: of or relating to or characteristic of Great Britain or
           its people or culture; "his wife is British"
    n 1: the people of Great Britain [syn: British, British
         people, Brits]