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in the PONS Dictionary

I. un·known [ʌnˈnəʊn, Am -ˈnoʊn] ADJ

1. unknown (not known):

unknown
unknown
to be unknown to sb
by a person [or persons]unknown LAW
an unknown quantity
the Unknown Soldier

2. unknown (not widely familiar):

unknown

II. un·known [ʌnˈnəʊn, Am -ˈnoʊn] N

1. unknown (sth not known):

unknown
Ungewissheit f <-, -en>
unknown MATH
Unbekannte f <-n, -n>
the unknown
a fear of the unknown

2. unknown (sb not widely familiar):

unknown
Unbekannte(r) f(m) <-n, -n; -n, -n>