unknown Meaning in the Cambridge English Dictionary
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Meaning of “unknown” in the English Dictionary

"unknown" in British English

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unknownadjective

uk   /ʌnˈnəʊn/  us   /-ˈnoʊn/
B1 not ​known or ​familiar: The ​exactnumber of ​peoplecarrying the ​virus is unknown. As ​recently as six ​months ago her ​name was ​almost unknown in this ​country. Unknown to me, she'd ​organized a ​party for my ​birthday.
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unknownnoun

uk   /ʌnˈnəʊn/  us   /-ˈnoʊn/
C1 [S] what is not ​familiar or ​known: Racism is in some ​ways just a ​fear of the unknown. [C] a ​person, ​especially a ​performer or ​sportsplayer, who is not ​famous: For her ​latestfilm she ​deliberatelychose a ​cast of unknowns. [C] mainly US something that cannot be ​guessed at or ​calculated because so little is ​known about it: It's the ​big unknowns that make ​insurancecompaniesuneasy.
(Definition of unknown from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"unknown" in American English

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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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