# petajoule

> English word · Noun

## Definitions
1. An SI unit of energy equal to 10¹⁵ joules. Symbol: PJ

## Etymology
From peta- + joule.

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