# mex

> English word · Noun · frequency rank #30,134

## Definitions
1. The mex of a subset of a well-ordered set is the smallest value from the whole set that does not belong to the subset.

## Etymology
Shortening of minimum excluded value.

## Easily confused with
- **my** (https://plainspell.com/en/vs/mex-vs-my)
- **Mr** (https://plainspell.com/en/vs/mex-vs-mr)
- **MS** (https://plainspell.com/en/vs/mex-vs-ms)
- **MM** (https://plainspell.com/en/vs/mex-vs-mm)
- **MO** (https://plainspell.com/en/vs/mex-vs-mo)
- **mi** (https://plainspell.com/en/vs/mex-vs-mi)
- **MP** (https://plainspell.com/en/vs/mex-vs-mp)
- **MT** (https://plainspell.com/en/vs/mex-vs-mt)
- **MG** (https://plainspell.com/en/vs/mex-vs-mg)
- **ML** (https://plainspell.com/en/vs/mex-vs-ml)
- **MN** (https://plainspell.com/en/vs/mex-vs-mn)
- **mu** (https://plainspell.com/en/vs/mex-vs-mu)
- **MK** (https://plainspell.com/en/vs/mex-vs-mk)
- **MW** (https://plainspell.com/en/vs/mex-vs-mw)
- **MV** (https://plainspell.com/en/vs/mex-vs-mv)
- **MJ** (https://plainspell.com/en/vs/mex-vs-mj)
- **Mx** (https://plainspell.com/en/vs/mex-vs-mx)
- **MH** (https://plainspell.com/en/vs/mex-vs-mh)
- **mom** (https://plainspell.com/en/vs/mex-vs-mom)
- **Mrs** (https://plainspell.com/en/vs/mex-vs-mrs)

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