# circadian

> English word · Adjective · IPA /səˈkeɪ.dɪ.ən/ · frequency rank #29,967

## Definitions
1. Of, relating to, or showing rhythmic behaviour with a period of approximately 24 hours; especially of a biological process.

## Etymology
From the Latin circā (“about”) and diēs (“a day”) with the English suffix -an. Compare circannual.

## Common misspellings (13)
`ccircadian`, `cicradian`, `ciracdian`, `circadain`, `circaddian`, `circadiann`, `circadina`, `circaidan`, `circcadian`, `circdaian`, `cirrcadian`, `cricadian`, `icrcadian`

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