mole fraction definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
the ratio of the number of moles of one constituent of a mixture or solution to the total number of moles of all the constituents
mole fraction - Medical Definition
The ratio of the moles of one component of a system to the total moles of all components present.