A division of a family, especially a division of a clan.
[Probably alteration of sect.]
The American Heritage® Dictionary of the English Language, Fourth Edition copyright ©2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
a clan, esp. in Ireland or Scotland [perhaps variant of sect]
Collins Essential English Dictionary 2nd Edition 2006 © HarperCollins Publishers 2004, 2006
1) noun, anthropol a clan or group that believes itself to be descended from a common ancestor
2) noun, a branch of a tribe or nation, esp in medieval Ireland or Scotland http://www.wordia.com/sept