adj., n., & v.
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. illegitimacy n. illegitimately adv.
[ LL illegitimus, after LEGITIMATE ]