Meaning of “illegitimate” - Learner’s Dictionary

illegitimate

adjective us uk /ˌɪlɪˈdʒɪtəmət/
CHILD

An illegitimate child is born to parents who are not married to each other.

NOT LEGAL

not legal, honest, or fair:

an illegitimate use of council funds
illegitimacy noun [ U ] us uk /ˌɪlɪˈdʒɪtəməsi/

(Definition of “illegitimate” from the Cambridge Learner’s Dictionary © Cambridge University Press)