unknown Meaning in Cambridge American English Dictionary
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Meaning of "unknown" - American English Dictionary

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unknownadjective

 us   /ʌnˈnoʊn/
not known, or not known to many people: His whereabouts are still unknown.

unknownnoun [C]

 us   /ʌnˈnoʊn/
a person who is not known to many people: A year ago she was a virtual unknown on the figure-skating scene.
(Definition of unknown from the Cambridge Academic Content Dictionary © Cambridge University Press)
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