GNU Collaborative International Dictionary of English

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1.       
   Sept , n. [A corruption of sect, n.] A clan, tribe, or family, proceeding from a common progenitor; -- used especially of the ancient clans in Ireland.
   1913 Webster
   The chief, struck by the illustration, asked at once to be baptized, and all his sept followed his example.
   S. Lover.
   
   1913 Webster