circadian.
Of, relating to, or showing rhythmic behaviour with a period of approximately 24 hours; especially of a biological process.
Meaning & usage
Of, relating to, or showing rhythmic behaviour with a period of approximately 24 hours; especially of a biological process.
Where this word comes from
Etymology tree Proto-Indo-European *(s)ker-der. Ancient Greek κίρκος (kírkos)bor. Latin circus Latin circum Latin circā Proto-Indo-European *dyew- Proto-Indo-European *-s Proto-Indo-European *dyḗws Proto-Italic *djous Latin diēs Proto-Indo-European *-nós Proto-Italic *-nos Proto-Italic *-ānos Latin -ānus Old French -ainder. Middle English -an English -an English circadian From Latin circā (“around”) + diēs (“day”) + English -an. Compare circannual.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.