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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.

The body normally uses sleep and circadian timing to coordinate repair processes.

From Science Daily • May 30, 2026

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

“I’ve noticed it makes me very low energy because my circadian rhythm relies on the sunrise to really wake up,” said Hannah M. Le, founder of Buckle Scrunchies, a hair-tie brand.

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

Not only was this arrangement bad for the astronaut’s circadian rhythm, but the astronaut who was on duty made enough noise as he went about his work to keep his partner awake.

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




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