# flat-earthism

> English word · Noun

## Definitions
1. The belief in, or advocacy for, the theory that the planet Earth is flat.

## Etymology
From flat-earth + -ism.

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