[an-ses-tree or, esp. British, -suh-stree]
noun, plural ancestries.
family or ancestral descent; lineage.
honorable or distinguished descent: famous by title and ancestry.
a series of ancestors: His ancestry settled Utah.
the inception or origin of a phenomenon, object, idea, or style.
the history or developmental process of a phenomenon, object, idea, or style.

1300–50; Middle English, equivalent to ancestre ancestor + -y3; replacing Middle English aunce(s)trie < Anglo-French

1. pedigree, genealogy, stock. 3. family, line. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ancestry (ˈænsɛstrɪ)
n , pl -tries
1.  lineage or descent, esp when ancient, noble, or distinguished
2.  ancestors collectively

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

early 14c., from O.Fr. ancesserie "ancestry, ancestors, forefathers," from ancestre (see ancestor), spelling modified by influence of ancestor.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Info on their medical history, ancestry, and current meds was already available
  but not linked to specific participants.
The proposition that other people have a right to forcibly evict such people by
  virtue of sharing the same ancestry is spurious.
The bones of its hind legs, for example, have played an important role in the
  dispute about bird ancestry.
But many owners have no knowledge of their cats' ancestry.
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