Definition of Britannic adjective from the Oxford Advanced Learner's Dictionary

 

Britannic

 adjective
adjective
BrE BrE//brɪˈtænɪk//
 
; NAmE NAmE//brɪˈtænɪk//
 
(old-fashioned, formal)
 
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(used mainly in names or titles) relating to Britain or the British Empire her Britannic Majesty (= the Queen) Word Origin mid 17th cent.: from Latin Britannicus, from Britannia ‘Britain.’.
See the Oxford Advanced American Dictionary entry: Britannic