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• n  one part in a hundred thousand equal parts

• Nanotechnology takes its name from a nanometer (nm), a billionth of a meter, or about one one-hundred-thousandth the diameter of a human hair.
• Viruses are the smallest known disease-producing organisms: the biggest of them is less than one-hundred-thousandth of an inch in diameter.
• It is not a very musical sound, for it lacks softening overtones, but it is accurate to one one-hundred-thousandth of a cycle.