noun
nanosecond; billionth of a second; ns
A unit of time equal to one billionth of a second. Used in technical and scientific contexts.
このプロセッサのクロック周期は数ナノセカンドだ。
The clock cycle of this processor is a few nanoseconds.
光は1ナノセカンドで
Light travels about 30 centimeters in one nanosecond.