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say it: uhn-NOHN
unknown is an adjective and noun meaning "not known". It carries 8 recorded senses.
not known
“an unknown amount”
“an unknown island”
“an unknown writer”
“an unknown source”
being or having an unknown or unnamed source
“a poem by an unknown author”
“corporations responsible to nameless owners”
“an unnamed donor”
not known before
“used many strange words”
“saw many strange faces in the crowd”
“don't let anyone unknown into the house”
an unknown and unexplored region
“they came like angels out the unknown”
a variable whose values are solutions of an equation
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for unknown come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.