What does circadian rhythm mean?

Definitions for circadian rhythm
cir·ca·dian rhythm

This dictionary definitions page includes all the possible meanings, example usage and translations of the word circadian rhythm.

Princeton's WordNet

  1. circadian rhythmnoun

    a daily cycle of activity observed in many living organisms


  1. circadian rhythmnoun

    The "internal body clock" that regulates the (roughly) 24-hour cycle of biological processes in animals and plants.


  1. Circadian rhythm

    A circadian rhythm is any biological process that displays an endogenous, entrainable oscillation of about 24 hours. These rhythms are driven by a circadian clock, and rhythms have been widely observed in plants, animals, fungi and cyanobacteria. The term circadian comes from the Latin circa, meaning "around", and diem or dies, meaning "day". The formal study of biological temporal rhythms, such as daily, tidal, weekly, seasonal, and annual rhythms, is called chronobiology. Although circadian rhythms are endogenous, they are adjusted to the local environment by external cues called zeitgebers, commonly the most important of which is daylight.

U.S. National Library of Medicine

  1. Circadian Rhythm

    The regular recurrence, in cycles of about 24 hours, of biological processes or activities, such as sensitivity to drugs and stimuli, hormone secretion, sleeping, feeding, etc. This rhythm seems to be set by a 'biological clock' which seems to be set by recurring daylight and darkness.

Editors Contribution

  1. circadian rhythm

    A type of daily cycle or rhythm.

    Circadian rhythm is observed in night and day and various human, plant and animal behaviors.

    Submitted by MaryC on September 6, 2020  

Suggested Resources

  1. circadian rhythm

    Song lyrics by circadian rhythm -- Explore a large variety of song lyrics performed by circadian rhythm on the Lyrics.com website.

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How to pronounce circadian rhythm?

How to say circadian rhythm in sign language?


  1. Chaldean Numerology

    The numerical value of circadian rhythm in Chaldean Numerology is: 6

  2. Pythagorean Numerology

    The numerical value of circadian rhythm in Pythagorean Numerology is: 1

Examples of circadian rhythm in a Sentence

  1. Raj Dasgupta:

    The dietary supplement melatonin is not a potent sleeping aid, it’s good for shifting your circadian rhythm. Usually, we suggest people take it two hours before their desired sleep time.

  2. Raj Dasgupta:

    If you ask me when's the perfect time to exercise, I think it's gon na be in the morning and outside in daylight. It resets the circadian rhythm and starts the day off with vigor, but if nighttime exercise is best for you, that's fine.

  3. Dianne Augelli:

    Estrogen works on several different neurotransmitter pathways that may have an impact on the regulation of sleep, and progesterone can have a hypnotic property, fluctuations in these hormones may have an effect on the circadian rhythm.

  4. Louise Batta:

    It's completely thrown off my circadian rhythm. It's hard to get up in the morning to go out of bed because I never know what time it is, i know that people joke all the time about how bad the living situation is, but it has truly had a negative impact on my grad school experience.

  5. Irina Mordukhovich:

    Women with three or more children are already probably not getting enough sleep, combine that with this disruption from the job, especially for those who fly internationally, this may be an indication that the circadian rhythm disruption is having an impact.

Translations for circadian rhythm

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"circadian rhythm." Definitions.net. STANDS4 LLC, 2023. Web. 25 Mar. 2023. <https://www.definitions.net/definition/circadian+rhythm>.

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    a bright spot on the parhelic circle; caused by diffraction by ice crystals
    • A. defilement
    • B. calcaneus
    • C. sundog
    • D. viverrine

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