Illegitimacy (noun)

1. The state of being born of parents who are not married to each other.
2. The state or quality of being illegitimate.
3. The fact of not being legally or morally valid.

Origin:

From the late latin ilegitimatus "not legitimate", from in- "not" + legitimus "legitimate".

Examples:

1. Illegitimacy rates have decreased in recent years.
2. The illegitimacy of the document caused it to be rejected.
3. He was stigmatized by the illegitimacy of his birth.
4. The illegitimacy of the government's actions caused widespread protest.
5. The court ruled that the will was illegitimate because it had been signed under duress.