# crucial

> English word · Adjective · IPA /ˈkɹuː.ʃəl/ · frequency rank #4,438

## Definitions
1. Essential or decisive for determining the outcome or future of something; extremely important; vital.
2. Cruciform or cruciate; cross-shaped.
3. Very good; excellent; particularly applied to reggae music.

## Etymology
1706, from French crucial, a medical term for ligaments of the knee (which cross each other), from Latin crux, crucis (“cross”) (English crux), from the Proto-Indo-European *(s)ker- (“to turn, to bend”).
The meaning “decisive, critical” is extended from a logical term, Instantias Crucis, adopted by Francis Bacon in his influential Novum Organum (1620); the notion is of cross fingerboard signposts at forking roads, thus a requirement to choose.

## Easily confused with
- **crucify** (https://plainspell.com/en/vs/crucial-vs-crucify)
- **crucible** (https://plainspell.com/en/vs/crucial-vs-crucible)
- **cruciate** (https://plainspell.com/en/vs/crucial-vs-cruciate)
- **crucially** (https://plainspell.com/en/vs/crucial-vs-crucially)
- **cranial** (https://plainspell.com/en/vs/cranial-vs-crucial)

## Common misspellings (10)
`ccrucial`, `crcuial`, `crrucial`, `crucail`, `cruccial`, `cruciall`, `crucila`, `cruical`, `curcial`, `rcucial`

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