Meaning of “illegitimate” - Learner’s Dictionary

illegitimate

adjective uk us /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 uk us /ˌɪlɪˈdʒɪtəməsi/ noun [ U ]

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