unknown quantity

Noun
  1. A factor in a given situation whose bearing and importance is not apparent (synset 107343036)
    "I don't know what the new man will do; he's still an unknown quantity"
    is a type of: factor - anything that contributes causally to a result
  2. A variable whose values are solutions of an equation (synset 107286353)
    is a type of: variable - a symbol (like x or y) that is used in mathematical or logical expressions to represent a variable quantity
    same as: unknown

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