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in the PONS Dictionary

I. unknown [ˌʌnˈnəʊn, Am -ˈnoʊn] ADJ

unknown
unknown
to be unknown to sth/sb
to be unknown to sth/sb (against one's will)

II. unknown [ˌʌnˈnəʊn, Am -ˈnoʊn] N

1. unknown (sth not known):

the unknown

2. unknown a. mat (undetermined element):

unknown
unknown

3. unknown (little-known person):

unknown