# concave

> English word · Adjective · IPA /ˈkɒn.keɪv/ · frequency rank #28,155

## Definitions
1. Curved like the inner surface of a sphere or bowl.
2. Not convex; having at least one internal angle greater than 180 degrees.
3. Satisfying the property that all segments connecting two points on the function's graph lie below the function.
4. Hollow; empty.

## Etymology
From Middle English concave, from Old French concave, from Latin concavus.

## Easily confused with
- **concede** (https://plainspell.com/en/vs/concave-vs-concede)
- **concise** (https://plainspell.com/en/vs/concave-vs-concise)
- **conceive** (https://plainspell.com/en/vs/concave-vs-conceive)
- **conclave** (https://plainspell.com/en/vs/concave-vs-conclave)

## Common misspellings (10)
`cconcave`, `cnocave`, `cocnave`, `conacve`, `concaev`, `concavve`, `conccave`, `concvae`, `conncave`, `ocncave`

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