For Diurnal we have terms and definitions in 13 topics. The topics are Anthromorphemics, Anthropology, Astrology, Climatology, Ecology, Horse Health, Hunting, Microbiology, New Age, Prostate Cancer, Sanitation, Satellite Meteorology and Weather.

Active during daylight hours.
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Active during daylight hours.
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Planets above the horizon (between the first and seventh cusps via the Mid-Heaven), versus Nocturnal: below the horizon.
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Daily; related to actions which are completed during a single calendar day, and which typically recur every calendar day (e.g., diurnal temperature cycle of temperature increase and decrease)
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Active during the day.
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Having a daily cycle or rhythm.
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Having a period or cycle of approximately one tidal day. Thus, the tide is said to be diurnal when only one high water and one low water occur during a tidal day, and the tidal current is said to be diurnal when there is a single flood and a single ebb period of a reversing current in the tidal day. A rotary current is diurnal if it changes its direction through all points of the compass once each tidal day. A diurnal constituent is one which has a single period in the constituent day. The symbol for such a constituent is the subscript 1. See stationary wave theory and type of tide.
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Pertaining to the daylight portion of the 24-h day.
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Refers to daytime, as opposed to nocturnal for nighttime. Planets above the horizon in a chart are in the diurnal section, planets below in the nocturnal.
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Pertaining to the day; having a cyclic nature involving the 24-hour day; prolactin levels are at their peak in the early morning- they have a diurnal variation; calcium utilization appears highest in the evening close to bedtime
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(1) Occurring during a 24-hr period, as in "diurnal variation". (2) Occurring during the daytime (as opposed to night time). (3) In tidal hydraulics, having a period or cycle of approximately one tidal day.
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Daily, pertaining to actions completed within or that recur every 24 hours.
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Daily; related to actions which are completed in the course of a calendar day, and which typically recur every calendar day (e.g., diurnal temperature rises during the day, and diurnal falls at night).
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