Etymology
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circadian (adj.)

coined 1959 by German-born biologist Franz Halberg, from Latin circa "about" (alternative form of circum "round about;" see circum-) + diem, accusative singular of dies "day" (from PIE root *dyeu- "to shine"). The original use is in circadian rhythm.

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Definitions of circadian

circadian (adj.)
of or relating to biological processes occurring at 24-hour intervals;
circadian rhythms
From wordnet.princeton.edu