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Dictionary

known' quan'tity

1. Math.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.
2. any factor, circumstance, etc., that is already accepted or familiar: Her honesty is a known quantity.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

know-nothing

Knox

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