circadian
adjective
Simple meaning
Of, about, or showing rhythmic behaviour with a period of about 24 hours.
Pronunciation
Say it like this:
serkaydeeuhnSay the bold part a little louder.
IPA pronunciation (US)
sɚˈkeɪdiən
This word is pronounced essentially the same in American and British English, so one transcription covers both.
IPA (International Phonetic Alphabet) is a standard way of writing speech sounds.
Definition
Everyday modern meanings first, grouped by part of speech.
adjective
biology
Of, relating to, or showing rhythmic behaviour with a period of approximately 24 hours; especially of a biological process.
Word at a Glance
- Difficulty
- C2 · Proficient (estimated)
- Frequency
- Uncommon
- Typical Use
- Primarily written
Word Aura™
How this word commonly comes across.
This meaning: Of, relating to, or showing rhythmic behaviour with a period of approximately 24 hours; especially of a biological process.
Used this way, circadian is a specialist word that usually carries little praise or criticism of its own. This is a scientific use: it names something precisely within a field of study, so it appears in research and teaching more than in conversation.
- Emotional tone
- Neutral
- Formality
- Specialist/technical
- Intensity
- Not strongly marked
- How common
- Specialized
- Connotation
- Clinical and technical
- Usage feel
- Technical and specialized
Where it naturally appears
- Science
- Academic writing
- Technical/specialist writing
Usage note
In general conversation this sense usually needs explaining — outside its field, people reach for a plainer word.
Word Aura describes common impressions, not a measurement. Tone changes with sentence, speaker, relationship and situation.
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Common Patterns and Combinations
How this word naturally appears with others.
Word Family
Related forms, grouped by how they connect.
Compound terms
Established multiword terms.
A daily cycle of activity observed in many living organisms.
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Dictionary data from Wiktionary via the Free Dictionary API. Simple meanings, combinations and word intelligence are built from verified reference data, no AI is used to load this page.