known quantity
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.
Origin of known quantity
First recorded in 1975–80
Words nearby known quantity
knowledge worker,
knowledge-based system,
knowledgeable,
knowles,
known,
known quantity,
knowsley,
knox,
knox-johnston,
knoxville,
knp