'Illegitimacy' definitions:

Definition of 'illegitimacy'

From: WordNet
noun
The status of being born to parents who were not married [syn: bastardy, illegitimacy, bar sinister]
noun
Unlawfulness by virtue of not being authorized by or in accordance with law [ant: legitimacy]

Definition of 'Illegitimacy'

From: GCIDE
  • Illegitimacy \Il`le*git"i*ma*cy\, n. The state of being illegitimate. --Blackstone. [1913 Webster]