Meaning of “illegitimate” in the English Dictionary

"illegitimate" in British English

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illegitimateadjective

uk /ˌɪl.ɪˈdʒɪt.ə.mət/ us /ˌɪl.ɪˈdʒɪt̬.ə.mət/

born of parents not married to each other

formal not legal or fair:

The rebels regard the official parliament as illegitimate.
illegitimacy
noun [ U ] uk /ˌɪl.ɪˈdʒɪt.ə.mə.si/ us /ˌɪl.ɪˈdʒɪt̬.ə.mə.si/

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

"illegitimate" in American English

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illegitimateadjective [ not gradable ]

us /ˌɪl·ɪˈdʒɪt̬·ə·mət/

born of parents not married to each other:

an illegitimate child

Illegitimate can also mean not legal:

an illegitimate ruler

(Definition of “illegitimate” from the Cambridge Academic Content Dictionary © Cambridge University Press)