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English definition of “unknown”

unknown

noun     /ʌnˈnəʊn/ US  /-ˈnoʊn/
C1 [S] what is not familiar or known : Racism is in some ways just a fear of the unknown.Unknown and unfamiliar [C] a person , especially a performer or sports player , who is not famous : For her latest film she deliberately chose a cast of unknowns.People of little importance [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 insurance companies uneasy .Unknown and unfamiliar
(Definition of unknown noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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