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known quantity
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noun
Mathematics. a quantity whose value is given: in algebra, frequently represented by a letter from the first part of the alphabet, as a, b, or c.
any factor, circumstance, etc., that is already accepted or familiar: Her honesty is a known quantity.
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Origin of known quantity
First recorded in 1975–80
Words nearby known quantity
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023