Longman Dictionary of Contemporary English homepage

unknown

2 noun
     
unknown2 [countable]
1 someone who is not famous:
At that point in her career she was still an unknown.
2 something that is not known:
The long-term effects of the drug are still an unknown.
3

the unknown

a) HA a place that is not known about or that has not been visited by humans:
The astronauts began their journey into the unknown.
b) things that you do not know or understand:
a fear of the unknown
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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