# nanosecond

> English word · Noun · frequency rank #62,353

## Definitions
1. An SI unit of time equal to 10⁻⁹ seconds. Symbol: ns

## Etymology
From nano- + second.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/nanosecond