# diagonal

> English word · Adjective · IPA /daɪˈæɡənəl/ · frequency rank #18,059

## Definitions
1. Joining two nonadjacent vertices (of a polygon or polyhedron).
2. Having slanted or oblique lines or markings.
3. Having a slanted or oblique direction.
4. Of or related to the cater-corner (diagonally opposite) legs of a quadruped, whether the front left and back right or front right and back left.

## Etymology
From Middle French diagonal, from Latin diagōnālis, from Ancient Greek διαγώνιος (diagṓnios, “from angle to angle”), from διά (diá, “across”) + γωνία (gōnía, “angle”).

## Easily confused with
- **diagonally** (https://plainspell.com/en/vs/diagonal-vs-diagonally)

## Common misspellings (11)
`daigonal`, `ddiagonal`, `diaggonal`, `diagnoal`, `diagoanl`, `diagonall`, `diagonla`, `diagonnal`, `diaognal`, `digaonal`, `idagonal`

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