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Definitions

circadian

[sur-key-dee-uhn] / sɜrˈkeɪ di ən /


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

However, sleep scientists and medical groups generally argue in favor of permanent standard time, saying it better aligns with human circadian rhythms and reduces health risks.

From Los Angeles Times • Mar. 7, 2026

She argues that switching to daylight-saving time ultimately plays havoc with our circadian rhythm — that is, our internal biological clock.

From MarketWatch • Mar. 6, 2026

Robertson says light pollution is increasing, which affects human circadian rhythms, and the lives of other species.

From BBC • Feb. 28, 2026

I’ve learned from experts over and over about how exposing yourself to natural light, even on an overcast day, either resets or talks to your circadian rhythm.

From The Wall Street Journal • Feb. 16, 2026

Heart muscles and circadian rhythms were interesting things to know about, but they were not the most important things, as far as we astronauts were concerned.

From "Flying to the Moon: An Astronaut's Story" by Michael Collins




Vocabulary lists containing circadian