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Definition of Unknown quantity
1. Noun. 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"
Generic synonyms: Factor
2. Noun. A variable whose values are solutions of an equation.
Definition of Unknown quantity
1. Noun. A person or thing whose nature or value is a mystery. ¹
¹ Source: wiktionary.com