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in the PONS Dictionary

I. un·known [ʌn'nəʊn] ADJ

unknown
unknown to me, ...

II. un·known [ʌn'nəʊn] N

1. unknown (sth not known):

unknown
unknown
unknown math
the unknown

2. unknown (sb not widely familiar):

unknown
unknown
anonimus m inf
to be of unknown provenance
finder of sth unknown
to be a virtual unknown