Relating to Britain, the British people, or the British Empire; British.
From Britannia (Latin for Britain) + -ic (adjective suffix). Commonly seen in the formal title 'Her Britannic Majesty.'
The phrase 'Britannic Majesty' appears in official British documents and treaties—it's a Latin-influenced formal way of saying 'British ruler' that harks back to the Roman names for Britain.
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