mole fraction

noun Chemistry.
  1. the ratio of the number of moles of a given component of a mixture to the total number of moles of all the components.

Origin of mole fraction

First recorded in 1920–25
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mole fraction in Medicine

mole fraction

n.
  1. The ratio of the moles of one component of a system to the total moles of all components present.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.