illegitimacy

The Century Dictionary: The Encyelopedic Lexicon of the English Language · 1887 · p. 328

(il-é-jit’i-ma-si), m. [ ma(te) + -cy.| The state or character of being illegitimate; specifically, bastardy; spuriousne : as, the illegitimacy of a child; the illegitimacy of an argument.