Briton

noun2

1. •
   An inhabitant of Great Britain, particularly (historical) a Celt from the area of Roman Britain or (obsolete) a Welshman; a British person.

   • The ancient Britons were particularly fond of Anglesey, which the Romans knew as Mona.
2. •
   A citizen of the United Kingdom or (historical, obsolete) its overseas empire.

   • The victims included 3 Canadians, 2 Irishmen, and 1 Briton.
   • The hiker was a Briton from New Zealand.