circadian means of, relating to, or showing rhythmic behaviour with a period of approximately 24 hours; especially of a biological process.
circadian is pronounced /səˈkeɪ.dɪ.ən/.
Why “circadian” is a great word
Relating to or exhibiting a biological rhythm with a cycle of approximately twenty-four hours. From the Latin circa ('about, approximately') and diēs ('day'), coined in 1959 by Franz Halberg. Unlike 'diurnal,' which specifies activity in daylight, or 'ultradian,' which describes rapid, minute-by-minute pulsing, circadian is the deep, internal metronome governing the tidal pull of consciousness itself. It is the dimming of the mind at dusk, the slow warmth returning to cold limbs at dawn, and the stubborn wakefulness at 3 a.m. when the world is silent—a reminder that we are not merely inhabitants of time, but creatures built from it.
adj
- Of, relating to, or showing rhythmic behaviour with a period of approximately 24 hours; especially of a biological process.e.g.“The circadian clock is involved in the regulation of the diurnal sleep-wake cycle, […].”
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