mole fraction

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noun Chemistry.

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

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Origin of mole fraction

First recorded in 1920–25

The judges who handle arraignments at criminal court in all five boroughs have a small fraction of their usual caseloads.
Shot Down During the NYPD Slowdown|Michael Daly|January 7, 2015|DAILY BEAST
Twitter mentions: 20,000, but still a tiny fraction of what was to come.
How the World Turned on Bill Cosby: A Day-by-Day Account|Scott Porch|December 1, 2014|DAILY BEAST
No, on the contrary, only a fraction of this country, a part which I would call the best of Italy, is against the Mafia.
Days of Mafia Mayhem Are Wracking Italy Once Again|Barbie Latza Nadeau|November 22, 2014|DAILY BEAST
It has a third of the budget and a fraction of the maritime vessels.
Britain’s Let-Em-All-Die Policy|Nico Hines, Barbie Latza Nadeau|November 1, 2014|DAILY BEAST

While it provides only a small fraction of the power used—about 1.5 percent—it does represent an important investment and symbol.
Charging Up|The Daily Beast|October 28, 2014|DAILY BEAST
The beauty, the mystery,—this fierce sunshine or something—stir——' She hesitated for a fraction of a second.
The Wave|Algernon Blackwood
He grew very restless, for it was a long time before Grandfather Mole appeared.
The Tale of Grandfather Mole|Arthur Scott Bailey
But she told Grandfather Mole that it was all right—that she knew a person of his age ought not to go without his breakfast.
The Tale of Grandfather Mole|Arthur Scott Bailey
And he had waited so long for Grandfather Mole that he had begun to feel hungry again.
The Tale of Grandfather Mole|Arthur Scott Bailey
One thing was certain: Grandfather Mole could travel much faster through the water than he could underground.
The Tale of Grandfather Mole|Arthur Scott Bailey

mole fraction

The ratio of the moles of one component of a system to the total moles of all components present.