# megasecond

> English word · Noun

## Definitions
1. An SI unit of time equal to 10⁶ seconds. Symbol: Ms. (= 11.5741 days)

## Etymology
From mega- + second.

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