known quantity
Americannoun
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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.
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any factor, circumstance, etc., that is already accepted or familiar.
Her honesty is a known quantity.
Etymology
Origin of known quantity
First recorded in 1975–80
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
“Tyler is more of a known quantity than his predecessor Albert Manifold, having joined BP’s board nearly 18 months ago and sat in the chair’s seat since Manifold’s acrimonious departure in May,” AJ Bell says.
From The Wall Street Journal ● Sep. 3, 2026
Todd Blanche is a known quantity in Trump World.
From Salon ● Apr. 22, 2026
As such, Warsh is a known quantity in upper-echelon social, political, and economic circles.
From Barron's ● Feb. 2, 2026
In each case, Riley has opted to keep the known quantity.
From Los Angeles Times ● Nov. 27, 2025
This young man’s reputation for personal bravery was a known quantity on the hunting-field.
From The Grey Lady by Henry Seton Merriman
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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
