verb (used with object)
to refuse to acknowledge as belonging or pertaining to oneself; deny the ownership of or responsibility for; repudiate; renounce: to disown one's heirs; to disown a published statement.

1610–20; dis-1 + own

disownment, noun

disclaim, disavow, reject, abjure.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
disown (dɪsˈəʊn)
(tr) to deny any connection with; refuse to acknowledge

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

c.1620, from dis- + own (v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Borrowers' freedom to disown their bad housing investments means the housing slump feeds on itself.
If reincarnated, he would probably disown attempts to use his own precepts for either censure or praise of contemporary movements.
They promise you everything while on active duty and then disown you when you retire.
Such companies evade unpaid fines and disown their previous enforcement records.
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