# diameter

> English word · Noun · IPA /daɪˈæmɪtə(ɹ)/ · frequency rank #6,230

## Definitions
1. Any straight line between two points on the circumference of a circle that passes through the centre/center of the circle; a chord that passes through the center of the circle.
2. The length of such a line.
3. The maximum distance between any two points in a metric space.
4. The maximum eccentricity over all vertices in a graph.

## Etymology
From Old French diametre (French diamètre), from Latin diametros, from Ancient Greek διάμετρος (diámetros) (γραμμή (grammḗ)) (diametros grammē, “line measuring across”), from διά (diá, “across”) + μέτρον (métron, “measure”). By surface analysis, dia- + -meter.

## Easily confused with
- **dieter** (https://plainspell.com/en/vs/diameter-vs-dieter)
- **diabetes** (https://plainspell.com/en/vs/diabetes-vs-diameter)

## Common misspellings (11)
`daimeter`, `ddiameter`, `diaemter`, `diameetr`, `diameterr`, `diametre`, `diametter`, `diammeter`, `diamteer`, `dimaeter`, `idameter`

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