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unknown quantity
 
Noun unknown quantity has 2 senses
  1. unknown quantity - a factor in a given situation whose bearing and importance is not apparent; "I don't know what the new man will do; he's still an unknown quantity"
    --1 is a kind of     factor
  2. unknown, unknown quantity - a variable whose values are solutions of an equation
    --2 is a kind of variable
unknouwn unknowable unknowing unknowingly unknowingness unknowledgeable unknown unknown unknown quantity unknown region unknown soldier unknowns unlabeled unlabelled unlace unlaced unlady like

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