1. [Adjective]: not known; "an unknown amount"; "an unknown island"; "an unknown writer"; "an unknown source"

2. [Noun]: a variable whose values are solutions of an equation

3. [Noun]: anyone who does not belong in the environment in which they are found

4. [Noun]: an unknown and unexplored region; "they came like angels out the unknown"

5. not known before; "used many strange words"; "saw many strange faces in the crowd"; "don''t let anyone unknown into the house"

6. being or having an unknown or unnamed source; "a poem by an unknown author"; "corporations responsible to nameless owners"; "an unnamed donor"

7. not famous or acclaimed; "an obscure family"; "unsung heroes of the war"

8. not known to exist; "things obscurely felt surged up from unsuspected depths in her"- Edith Wharton

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