—adj.
1 (of a child) born of parents not married to each other.
2 not authorized by law; unlawful.
3 improper.
4 wrongly inferred.
5 physiologically abnormal.
—n. a person whose position is illegitimate, esp. by birth.
—v.tr. declare or pronounce illegitimate.
Derivatives:
illegitimacy n. illegitimately adv.
Etymology: LL illegitimus, after LEGITIMATE
Useful english dictionary. 2012.