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- Dictionarynan·o·sec·ond/ˈnanōˌsek(ə)n(d)/
noun
- 1. one billionth of a second.
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noun
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SI unit of time
A nanosecond (ns) is a unit of time in the International System of Units (SI) equal to one billionth of a second, that is, 1⁄1 000 000 000 of a second, or 10−9 seconds. The term combines the SI prefix nano- indicating a 1 billionth submultiple of an SI unit (e.g. nanogram, nanometre, etc.) and second, the primary unit of time in the SI. A nanosecond is equal to 1000 picoseconds or 1⁄1000 microseco... Wikipedia