Unknown quantity

noun

Definitions

Noun
  1. 1
    A person or thing whose nature or value is a mystery. idiomatic

    "Whatever he had learned of himself was here of no avail. He was an unknown quantity."

  2. 2
    a variable whose values are solutions of an equation wordnet
  3. 3
    Used other than figuratively or idiomatically: see unknown, quantity.

    "Many of the applications of mathematics require that you identify an unknown quantity, assign a variable to that quantity, and then attempt to express another unknown quantity in terms of that variable."

  4. 4
    a factor in a given situation whose bearing and importance is not apparent wordnet

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