1. (noun) unknown, unknown region, terra incognita
an unknown and unexplored region
"they came like angels out the unknown"
2. (noun) stranger, alien, unknown
anyone who does not belong in the environment in which they are found
3. (adj) unknown, unknown quantity
a variable whose values are solutions of an equation
4. (adj) unknown
not known
"an unknown amount"; "an unknown island"; "an unknown writer"; "an unknown source"
5. (adj) nameless, unidentified, unknown, unnamed
being or having an unknown or unnamed source
"a poem by an unknown author"; "corporations responsible to nameless owners"; "an unnamed donor"
6. (adj) unknown
not known to exist
"things obscurely felt surged up from unknown depths"
7. (adj) obscure, unknown, unsung
not famous or acclaimed
"an obscure family"; "unsung heroes of the war"
8. (adj) strange, unknown
not known before
"used many strange words"; "saw many strange faces in the crowd"; "don't let anyone unknown into the house"
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Definition of 'unknown' 
