# rational number

> English word · Noun

## Definitions
1. A number that can be expressed as the ratio of two integers.

## Etymology
From rational + number, ultimately from Latin rationalis + numerus. Compare analogous logarithm, from Ancient Greek.

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