Diurnal (noun) refers to a creature or process that is active during the day. In biology, it denotes species whose activity is primarily daytime-related, as opposed to nocturnal. In a broader sense, diurnal can describe events, patterns, or cycles that occur within a 24-hour day and are tied to daylight. Two daily phases are dawn-to-dusk usage examples: diurnal rhythms and diurnal animals.
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