There are multiple definitions - click on the translation that matches your context.

bezprawność

rzeczownik

full

illegitimacy

noun

Definitions of illegitimacy

the state of being born to parents who are not married to each other

There were rumours of illegitimacy in the family.

the state of being unlawful or not authorized by law

The election results should put an end to claims concerning the alleged illegitimacy of the Westlandian authorities.