Source : Webster's Revised Unabridged Dictionary (1913)

Briton \Brit"on\, a. [AS. bryten Britain.]
   British. [Obs.] --Spenser. -- n. A native of Great Britain.

Source : WordNet®

Briton
     adj : characteristic of or associated with the Britons; "the
           Briton inhabitants of England"
     n 1: a native or inhabitant of Great Britain [syn: {Britisher}, {Brit}]
     2: an inhabitant of southern Britain prior to the Anglo-saxon
        invasions