noun, plural illegitimacies.
the state or quality of being illegitimate.

1670–80; illegitim(ate) + -acy Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
illegitimate (ˌɪlɪˈdʒɪtɪmɪt)
1.  born of parents who were not married to each other at the time of birth; bastard
2.  forbidden by law; illegal; unlawful
3.  contrary to logic; incorrectly reasoned
4.  an illegitimate person; bastard

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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American Heritage
Cultural Dictionary

illegitimacy definition

The condition of being born to unmarried parents. It was once considered a mark of disgrace but is generally more accepted now.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia Britannica


status of children begotten and born outside of wedlock. Many statutes either state, or are interpreted to mean, that usually a child born under a void marriage is not illegitimate if his parents clearly believed that they were legally married. Similarly, annulment of a marriage usually does not illegitimize the children.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
When the overall illegitimacy rate in this country hits that number, our
  society will collapse.
And those have been tangled up in endless legal problems, all of which project
  an aura of illegitimacy to the world.
But, to tell the truth, there was sod all romantic about our illegitimacy.
Desertion and illegitimacy have been with us for a long time and unfortunately
  may be on the increase.
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