one-billionth

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Noun1.one-billionth - one part in a billion equal parts
common fraction, simple fraction - the quotient of two integers
References in periodicals archive ?
The ChemCam laser delivers over a million watts of power in short laser bursts of five one-billionths of a second, vaporizing the rock in the process and creating a plasma.
When the smallest features on a chip shrink to less than 10 nanometers -- 10 one-billionths of a meter -- current chipmaking technology will reach its ultimate limits.