Briton

[brit-n] /ˈbrɪt n/
noun
1.
a native or inhabitant of Great Britain, especially of England.
2.
one of the Celtic people formerly occupying the southern part of the island of Britain.
Origin
1250-1300; < Medieval Latin Britōn- (stem of Britō); replacing Middle English Breton < Old French < Late Latin Brittōnēs Britons
Can be confused
Britain, Briton.
British Dictionary definitions for Briton

Briton

/ˈbrɪtən/
noun
1.
a native or inhabitant of Britain
2.
a citizen of the United Kingdom
3.
(history) any of the early Celtic inhabitants of S Britain who were largely dispossessed by the Anglo-Saxon invaders after the 5th century ad
Word Origin
C13: from Old French Breton, from Latin Britto, of Celtic origin
Word Origin and History for Briton
n.

Anglo-French Bretun, from Latin Brittonem (nominative Britto, misspelled Brito in MSS) "a member of the tribe of the Britons," from *Britt-os, the Celtic name of the Celtic inhabitants of Britain and southern Scotland before the 5c. Anglo-Saxon invasion drove them into Wales, Cornwall, and a few other corners. In 4c. B.C.E. Greek they are recorded as Prittanoi, which is said to mean "tattooed people." Exclusively in historical use after Old English period; revived when James I was proclaimed King of Great Britain in 1604, and made official at the union of England and Scotland in 1707.