Definition of unknown noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//ˌʌnˈnəʊn//
    ; NAmE NAmE//ˌʌnˈnoʊn//
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  1. 1the unknown [singular] places or things that are not known about a journey into the unknown a fear of the unknown
  2. 2[countable] a person who is not well known A young unknown played the leading role.
  3. 3[countable] a fact or an influence that is not known There are so many unknowns in the proposal.
  4. 4[countable] (mathematics) a quantity that does not have a known value X and Y in the equation are both unknowns.
  5. Extra examples Motherhood was for her a journey into the unknown. The championship was won by a complete unknown. This action represents a leap into the unknown. What the weather will be like on the day is, as always, the great unknown. a cast of virtual unknowns
See the Oxford Advanced American Dictionary entry: unknown