Brittonic or Brythonic may refer to:
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Common Brittonic, or Brythonic, the Celtic language anciently spoken in Great Britain
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Brittonic languages
The Brittonic languages (also Brythonic or British Celtic; cy, ieithoedd Brythonaidd/Prydeinig; kw, yethow brythonek/predennek; br, yezhoù predenek) form one of the two branches of the Insular Celtic language family; the other is Goidelic ...
, a branch of the Celtic languages descended from Common Brittonic
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Britons (Celtic people), or Celtic Britons, the Celtic people of Great Britain in ancient times
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Language and nationality disambiguation pages