World English Dictionary
unknown (ʌnˈnəʊn)
1.  not known, understood, or recognized
2.  not established, identified, or discovered: an unknown island
3.  not famous; undistinguished: some unknown artist
4.  unknown quantity a person or thing whose action, effect, etc, is unknown or unpredictable
5.  an unknown person, quantity, or thing
6.  maths a variable, or the quantity it represents, the value of which is to be discovered by solving an equation; a variable in a conditional equation: 3y = 4x + 5 is an equation in two unknowns

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