the GNU version of the Collaborative International Dictionary of English
n. The state of being illegitimate.
The Century Dictionary and Cyclopedia
n. The state or character of being illegitimate; specifically, bastardy; spuriousness: as, the illegitimacy of a child; the illegitimacy of an argument.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the status of being born to parents who were not married
n. unlawfulness by virtue of not being authorized by or in accordance with law
Word Usage
"Mexican-American illegitimacy is much higher than non-Hispanic white illegitimacy."