# octane

> English word · Noun · IPA /ˈɒkteɪn/ · frequency rank #26,190

## Definitions
1. Any of the eighteen isomeric aliphatic hydrocarbons (C₈H₁₈) found in petroleum, especially an iso-octane 2,2,4 trimethyl-pentane; they are used as fuels and solvents.
2. octane number

## Etymology
From oct- + -ane.

## Easily confused with
- **outage** (https://plainspell.com/en/vs/octane-vs-outage)
- **octave** (https://plainspell.com/en/vs/octane-vs-octave)
- **ocean** (https://plainspell.com/en/vs/ocean-vs-octane)

## Common misspellings (8)
`cotane`, `ocatne`, `occtane`, `octaen`, `octanne`, `octnae`, `octtane`, `otcane`

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