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diurnal science definition
- a. Occurring once in a 24-hour period; daily.b. Having a 24-hour cycle. The movement of stars and other celestial objects across the sky are diurnal.
- Most active during the daytime. Many animals, including the apes, are diurnal.
- Having leaves or flowers that open in daylight and close at night. The morning glory and crocus are diurnal. Compare nocturnal.
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