# Russell's paradox

> English word · Proper noun

## Definitions
1. The paradox that a set defined to contain all sets which do not contain themselves can neither consistently contain itself nor not contain itself.

## Etymology
Named after English mathematician, logician and philosopher Bertrand Russell.

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