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"
unknown, unknown quantity(noun)
a variable whose values are solutions of an equation
A person or thing whose nature or value is a mystery.
The numerical value of unknown quantity in Chaldean Numerology is: 5
The numerical value of unknown quantity in Pythagorean Numerology is: 5
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"unknown quantity." Definitions.net. STANDS4 LLC, 2017. Web. 30 Mar. 2017. <http://www.definitions.net/definition/unknown quantity>.