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unknown quantity in WordNet English dictionary
noun- a variable whose values are solutions of an equation
unknown 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"
unknown quantity
WordNet Lexical Database v3.0, © 2006 Princeton University
unknown quantity in English Wiktionary
- (noun) A person or thing whose nature or value is a mystery.
Wiktionary, GNU Free Documentation Licence