illegitimate
US /ˌɪl.ɪˈdʒɪt̬.ə.mət/
UK /ˌɪl.ɪˈdʒɪt̬.ə.mət/
1.
not authorized by law; unlawful
:
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The court declared the contract illegitimate.
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His claim to the throne was considered illegitimate.
2.
(of a child) born of parents not married to each other; born out of wedlock
:
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In the past, an illegitimate child often faced social stigma.
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The novel tells the story of an illegitimate heir.