unknown quantity

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• March 4. 2016 from wordnet.princeton.edu

  unknown quantity — noun — english

  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"

• March 4. 2016 from wordnet.princeton.edu

  unknown quantity — noun — english

  a variable whose values are solutions of an equation